The list is ordered from the oldest to the most recent announcement made by the Riot staff regarding skin sales.

Pre-Seasons Seasons
Pre-Season One Season One
Pre-Season Two Season Two
Pre-Season Three Season Three
Pre-Season Four Season Four
Pre-Season Five Season Five
Pre-Season Six Season Six
Pre-Season Seven Season Seven
Early Sales


Period Sales Link
January 14
2014
January 17
2014
Lee SinSquare Dragon Fist Lee Sin [S|L] - 50% off
VayneSquare Heartseeker Vayne [S|L] - 50% off
Twisted FateSquare Tango Twisted Fate [S|L] - 50% off
[1]
January 17
2014
January 20
2014
HeimerdingerSquare Piltover Customs Heimerdinger [S|L] - 50% off
SingedSquare Mad Scientist Singed [S|L] - 50% off
VolibearSquare Thunder Lord Volibear [S|L] - 50% off
[2]
January 21
2014
January 24
2014
PantheonSquare Glaive Warrior Pantheon [S|L] - 50% off
Kog'MawSquare Lion Dance Kog'Maw [S|L] - 50% off
EvelynnSquare Tango Evelynn [S|L] - 50% off
[3]
January 24
2014
January 27
2014
ShyvanaSquare Darkflame Shyvana [S|L] - 50% off
FiddlesticksSquare Fiddle Me Timbers [S|L] - 50% off
ShacoSquare Mad Hatter Shaco [S|L] - 50% off
[4]
January 28
2014
January 31
2014
FizzSquare Fisherman Fizz [S|L] - 50% off
ShenSquare Surgeon Shen [S|L] - 50% off
CassiopeiaSquare Siren Cassiopeia [S|L] - 50% off
[5]
January 31
2014
February 3
2014
ThreshSquare Deep Terror Thresh [S|L] - 50% off
KarthusSquare Pentakill Karthus [S|L] - 50% off
TeemoSquare Recon Teemo [S|L] - 50% off
[6]
February 4
2014
February 7
2014
BlitzcrankSquare iBlitzcrank [S|L] - 50% off
NasusSquare Dreadknight Nasus [S|L] - 50% off
AnnieSquare Prom Queen Annie [S|L] - 50% off
[7]
February 7
2014
February 10
2014
LuluSquare Bittersweet Lulu [S|L] - 50% off
MalphiteSquare Coral Reef Malphite [S|L] - 50% off
SwainSquare Bilgewater Swain [S|L] - 50% off
[8]
February 11
2014
February 14
2014
VladimirSquare Vandal Vladimir [S|L] - 50% off
MorganaSquare Exiled Morgana [S|L] - 50% off
JannaSquare Tempest Janna [S|L] - 50% off
[9]
February 14
2014
February 17
2014
JayceSquare Debonair Jayce [S|L] - 50% off
VayneSquare Heartseeker Vayne [S|L] - 50% off
Twisted FateSquare Jack of Hearts Twisted Fate [S|L] - 50% off
[10]
February 18
2014
February 21
2014
SingedSquare Surfer Singed [S|L] - 50% off
SonaSquare Arcade Sona [S|L] - 50% off
AlistarSquare Longhorn Alistar [S|L] - 50% off
[11]
February 21
2014
February 24
2014
LuxSquare Steel Legion Lux [S|L] - 50% off
PantheonSquare Perseus Pantheon [S|L] - 50% off
PoppySquare Battle Regalia Poppy [S|L] - 50% off
[12]
February 25
2014
February 28
2014
TwitchSquare Vandal Twitch [S|L] - 50% off
Miss FortuneSquare Secret Agent Miss Fortune [S|L] - 50% off
AmumuSquare Emumu [S|L] - 50% off
[13]
February 28
2014
March 3
2014
CassiopeiaSquare Jade Fang Cassiopeia [S|L] - 50% off
TryndamereSquare Viking Tryndamere [S|L] - 50% off
LeonaSquare Valkyrie Leona [S|L] - 50% off
[14]
March 4
2014
March 7
2014
TaricSquare Armor of the Fifth Age Taric [S|L] - 50% off
TeemoSquare Astronaut Teemo [S|L] - 50% off
CaitlynSquare Sheriff Caitlyn [S|L] - 50% off
[15]
March 7
2014
March 10
2014
RammusSquare Ninja Rammus [S|L] - 50% off
TrundleSquare Junkyard Trundle [S|L] - 50% off
RenektonSquare Outback Renekton [S|L] - 50% off
[16]
March 11
2014
March 14
2014
GragasSquare Vandal Gragas [S|L] - 50% off
AnnieSquare Panda Annie [S|L] - 50% off
BlitzcrankSquare Boom Boom Blitzcrank [S|L] - 50% off
[17]
March 14
2014
March 17
2014
MalphiteSquare Shamrock Malphite [S|L] - 50% off
VeigarSquare Leprechaun Veigar [S|L] - 50% off
TaricSquare Emerald Taric [S|L] - 50% off
[18]
March 18
2014
March 21
2014
CorkiSquare Dragonwing Corki [S|L] - 50% off
Xin ZhaoSquare Warring Kingdoms Xin Zhao [S|L] - 50% off
KennenSquare Karate Kennen [S|L] - 50% off
[19]
March 21
2014
March 24
2014
AkaliSquare Blood Moon Akali [S|L] - 50% off
SwainSquare Northern Front Swain [S|L] - 50% off
Lee SinSquare Traditional Lee Sin [S|L] - 50% off
[20]
March 25
2014
March 28
2014
AsheSquare Queen Ashe [S|L] - 50% off
WukongSquare Jade Dragon Wukong [S|L] - 50% off
TryndamereSquare King Tryndamere [S|L] - 50% off
[21]
March 28
2014
March 31
2014
SonaSquare Guqin Sona [S|L] - 50% off
Twisted FateSquare Musketeer Twisted Fate [S|L] - 50% off
GravesSquare Hired Gun Graves [S|L] - 50% off
[22]
April 1
2014
April 4
2014
CorkiSquare Urfrider Corki [S|L] - 50% off
FizzSquare Fisherman Fizz [S|L] - 50% off
ShacoSquare Royal Shaco [S|L] - 50% off
[23]
April 4
2014
April 7
2014
TalonSquare Dragonblade Talon [S|L] - 50% off
LeBlancSquare Wicked LeBlanc [S|L] - 50% off
KassadinSquare Pre-Void Kassadin [S|L] - 50% off
[24]
April 8
2014
April 11
2014
MaokaiSquare Charred Maokai [S|L] - 50% off
ZiggsSquare Mad Scientist Ziggs [S|L] - 50% off
IreliaSquare Nightblade Irelia [S|L] - 50% off
[25]
April 11
2014
April 14
2014
TwitchSquare Gangster Twitch [S|L] - 50% off
KatarinaSquare High Command Katarina [S|L] - 50% off
Master YiSquare Chosen Master Yi [S|L] - 50% off
[26]
April 15
2014
April 18
2014
KennenSquare Kennen M. D. [S|L] - 50% off
Jarvan IVSquare Warring Kingdoms Jarvan IV [S|L] - 50% off
OriannaSquare Gothic Orianna [S|L] - 50% off
[27]
April 18
2014
April 21
2014
PoppySquare Scarlet Hammer Poppy [S|L] - 50% off
MorganaSquare Blade Mistress Morgana [S|L] - 50% off
NidaleeSquare French Maid Nidalee [S|L] - 50% off
[28]
April 22
2014
April 25
2014
MalphiteSquare Obsidian Malphite [S|L] - 50% off
NocturneSquare Frozen Terror Nocturne [S|L] - 50% off
GalioSquare Enchanted Galio [S|L] - 50% off
[29]
April 25
2014
April 28
2014
QuinnSquare Phoenix Quinn [S|L] - 50% off
WukongSquare General Wukong [S|L] - 50% off
SkarnerSquare Earthrune Skarner [S|L] - 50% off
[30]
April 29
2014
May 2
2014
SorakaSquare Celestine Soraka [S|L] - 50% off
NautilusSquare AstroNautilus [S|L] - 50% off
RenektonSquare Galactic Renekton [S|L] - 50% off
[31]
May 2
2014
May 5
2014
AkaliSquare Nurse Akali [S|L] - 50% off
KarmaSquare Sun Goddess Karma [S|L] - 50% off
MalzaharSquare Shadow Prince Malzahar [S|L] - 50% off
[32]
May 6
2014
May 9
2014
BrandSquare Cryocore Brand [S|L] - 50% off
DariusSquare Lord Darius [S|L] - 50% off
RumbleSquare Bilgerat Rumble [S|L] - 50% off
[33]
May 9
2014
May 12
2014
Xin ZhaoSquare Viscero Xin Zhao [S|L] - 50% off
LeonaSquare Defender Leona [S|L] - 50% off
AsheSquare Freljord Ashe [S|L] - 50% off
[34]
May 13
2014
May 16
2014
DravenSquare Gladiator Draven [S|L] - 50% off
ZiggsSquare Pool Party Ziggs [S|L] - 50% off
KayleSquare Viridian Kayle [S|L] - 50% off
[35]
May 16
2014
May 19
2014
Miss FortuneSquare Mafia Miss Fortune [S|L] - 50% off
GarenSquare Rugged Garen [S|L] - 50% off
KennenSquare Deadly Kennen [S|L] - 50% off
[36]
May 20
2014
May 23
2014
ZacSquare Special Weapon Zac [S|L] - 50% off
RivenSquare Battle Bunny Riven [S|L] - 50% off
RammusSquare Freljord Rammus [S|L] - 50% off
[37]
May 23
2014
May 26
2014
LuxSquare Imperial Lux [S|L] - 50% off
VolibearSquare Northern Storm Volibear [S|L] - 50% off
SorakaSquare Dryad Soraka [S|L] - 50% off
[38]
May 27
2014
May 30
2014
Twisted FateSquare High Noon Twisted Fate [S|L] - 50% off
Kha'ZixSquare Mecha Kha'Zix [S|L] - 50% off
SivirSquare Warrior Princess Sivir [S|L] - 50% off
[39]
May 3
2014
June 2
2014
NidaleeSquare Headhunter Nidalee [S|L] - 50% off
AhriSquare Midnight Ahri [S|L] - 50% off
NocturneSquare Void Nocturne [S|L] - 50% off
[40]
June 3
2014
June 6
2014
NautilusSquare Subterranean Nautilus [S|L] - 50% off
ShacoSquare Masked Shaco [S|L] - 50% off
AkaliSquare Stinger Akali [S|L] - 50% off
[41]
June 6
2014
June 9
2014
ZileanSquare Shurima Desert Zilean [S|L] - 50% off
BrandSquare Apocalyptic Brand [S|L] - 50% off
KassadinSquare Deep One Kassadin [S|L] - 50% off
[42]
June 10
2014
June 13
2014
TeemoSquare Cottontail Teemo [S|L] - 50% off
UrgotSquare Battlecast Urgot [S|L] - 50% off
LeBlancSquare Prestigious LeBlanc [S|L] - 50% off
[43]
June 13
2014
June 16
2014
WarwickSquare Hyena Warwick [S|L] - 50% off
Jarvan IVSquare Dragonslayer Jarvan IV [S|L] - 50% off
VladimirSquare Count Vladimir [S|L] - 50% off
[44]
June 17
2014
June 20
2014
LissandraSquare Bloodstone Lissandra [S|L] - 50% off
Master YiSquare Ionia Master Yi [S|L] - 50% off
Kog'MawSquare Monarch Kog'Maw [S|L] - 50% off
[45]
June 20
2014
June 23
2014
MorganaSquare Sinful Succulence Morgana [S|L] - 50% off
EzrealSquare Explorer Ezreal [S|L] - 50% off
AmumuSquare Almost-Prom King Amumu [S|L] - 50% off
[46]
June 24
2014
June 27
2014
ShyvanaSquare Ice Drake Shyvana [S|L] - 50% off
SwainSquare Tyrant Swain [S|L] - 50% off
MalphiteSquare Marble Malphite [S|L] - 50% off
[47]
June 27
2014
June 30
2014
Lee SinSquare Muay Thai Lee Sin [S|L] - 50% off
Miss FortuneSquare Cowgirl Miss Fortune [S|L] - 50% off
AsheSquare Woad Ashe [S|L] - 50% off
[48]
July 1
2014
July 4
2014
VolibearSquare Runeguard Volibear [S|L] - 50% off
MordekaiserSquare Pentakill Mordekaiser [S|L] - 50% off
KatarinaSquare Mercenary Katarina [S|L] - 50% off
[49]
July 4
2014
July 7
2014
AhriSquare Dynasty Ahri [S|L] - 50% off
SivirSquare Bandit Sivir [S|L] - 50% off
PantheonSquare Myrmidon Pantheon [S|L] - 50% off
[50]
July 8
2014
July 11
2014
KayleSquare Battleborn Kayle [S|L] - 50% off
AmumuSquare Sad Robot Amumu [S|L] - 50% off
GragasSquare Hillbilly Gragas [S|L] - 50% off
[51]
July 7
2014
July 14
2014
AkaliSquare Silverfang Akali [S|L] - 50% off
FioraSquare Nightraven Fiora [S|L] - 50% off
FiddlesticksSquare Bandito Fiddlesticks [S|L] - 50% off
[52]
July 15
2014
July 18
2014
SejuaniSquare Darkrider Sejuani [S|L] - 50% off
SonaSquare Pentakill Sona [S|L] - 50% off
VayneSquare Vindicator Vayne [S|L] - 50% off
[53]
July 18
2014
July 21
2014
Kog'MawSquare Deep Sea Kog'Maw [S|L] - 50% off
VeigarSquare Veigar Greybeard [S|L] - 50% off
GarenSquare Sanguine Garen [S|L] - 50% off
[54]
July 22
2014
July 25
2014
JannaSquare Hextech Janna [S|L] - 50% off
MalphiteSquare Glacial Malphite [S|L] - 50% off
WarwickSquare Tundra Hunter Warwick [S|L] - 50% off
[55]
July 25
2014
July 28
2014
AlistarSquare Infernal Alistar [S|L] - 50% off
ShyvanaSquare Ironscale Shyvana [S|L] - 50% off
Master YiSquare Samurai Yi [S|L] - 50% off
[56]
July 30
2014
August 1
2014
VarusSquare Arclight Varus [S|L] - 50% off
KatarinaSquare Sandstorm Katarina [S|L] - 50% off
SingedSquare Hextech Singed [S|L] - 50% off
[57]
August 1
2014
August 4
2014
MorganaSquare Ghost Bride Morgana [S|L] - 50% off
TalonSquare Crimson Elite Talon [S|L] - 50% off
KarthusSquare Statue of Karthus [S|L] - 50% off
[58]
August 5
2014
August 8
2014
ZacSquare Special Weapon Zac [S|L] - 50% off
DravenSquare Soul Reaver Draven [S|L] - 50% off
GangplankSquare Minuteman Gangplank [S|L] - 50% off
[59]
August 8
2014
August 11
2014
ZiggsSquare Major Ziggs [S|L] - 50% off
AniviaSquare Hextech Anivia [S|L] - 50% off
Miss FortuneSquare Waterloo Miss Fortune [S|L] - 50% off
[60]
August 12
2014
August 15
2014
AhriSquare Foxfire Ahri [S|L] - 50% off
AatroxSquare Justicar Aatrox [S|L] - 50% off
LuxSquare Sorceress Lux [S|L] - 50% off
[61]
August 15
2014
August 18
2014
DariusSquare Woad King Darius [S|L] - 50% off
XerathSquare Runeborn Xerath [S|L] - 50% off
RyzeSquare Uncle Ryze [S|L] - 50% off
[62]
August 19
2014
August 22
2014
VeigarSquare Superb Villain Veigar [S|L] - 50% off
HecarimSquare Arcade Hecarim [S|L] - 50% off
OlafSquare Forsaken Olaf [S|L] - 50% off
[63]
August 22
2014
August 25
2014
Dr. MundoSquare Rageborn Mundo [S|L] - 50% off
CaitlynSquare Arctic Warfare Caitlyn [S|L] - 50% off
NocturneSquare Ravager Nocturne [S|L] - 50% off
[64]
August 26
2014
August 29
2014
TaricSquare Bloodstone Taric [S|L] - 50% off
SionSquare Warmonger Sion [S|L] - 50% off
HeimerdingerSquare Blast Zone Heimerdinger [S|L] - 50% off
[65]
August 30
2014
September 1
2014
LeonaSquare Iron Solari Leona [S|L] - 50% off
AmumuSquare Little Knight Amumu [S|L] - 50% off
Jarvan IVSquare Commando Jarvan IV [S|L] - 50% off
[66]
September 2
2014
September 5
2014
Lee SinSquare Pool Party Lee Sin [S|L] - 50% off
BlitzcrankSquare iBlitzcrank [S|L] - 50% off
AnnieSquare Prom Queen Annie [S|L] - 50% off
[67]
September 5
2014
September 8
2014
TristanaSquare Rocket Girl Tristana [S|L] - 50% off
FizzSquare Tundra Fizz [S|L] - 50% off
EzrealSquare Frosted Ezreal [S|L] - 50% off
[68]
September 9
2014
September 12
2014
Kog'MawSquare Jurassic Kog'Maw [S|L] - 50% off
IreliaSquare Frostblade Irelia [S|L] - 50% off
Twisted FateSquare Tango Twisted Fate [S|L] - 50% off
[69]
September 12
2014
September 15
2014
ZedSquare Shockblade Zed [S|L] - 50% off
FiddlesticksSquare Fiddle Me Timbers [S|L] - 50% off
VolibearSquare Thunder Lord Volibear [S|L] - 50% off
[70]
September 16
2014
September 19
2014
JaxSquare Nemesis Jax [S|L] - 50% off
GravesSquare Pool Party Graves [S|L] - 50% off
XerathSquare Battlecast Xerath [S|L] - 50% off
[71]
September 19
2014
September 22
2014
RenektonSquare Pool Party Renekton [S|L] - 50% off
KarthusSquare Pentakill Karthus [S|L] - 50% off
FioraSquare Royal Guard Fiora [S|L] - 50% off
[72]
September 23
2014
September 26
2014
LucianSquare Hired Gun Lucian [S|L] - 50% off
ThreshSquare Deep Terror Thresh [S|L] - 50% off
Dr. MundoSquare Executioner Mundo [S|L] - 50% off
[73]
September 26
2014
September 29
2014
RyzeSquare Dark Crystal Ryze [S|L] - 50% off
SingedSquare Mad Scientist Singed [S|L] - 50% off
OriannaSquare Sewn Chaos Orianna [S|L] - 50% off
[74]
September 30
2014
October 3
2014
LeonaSquare Pool Party Leona [S|L] - 50% off
LuluSquare Dragon Trainer Lulu [S|L] - 50% off
CaitlynSquare Resistance Caitlyn [S|L] - 50% off
[75]
October 3
2014
October 6
2014
CorkiSquare Dragonwing Corki [S|L] - 50% off
RammusSquare Chrome Rammus [S|L] - 50% off
BlitzcrankSquare Boom Boom Blitzcrank [S|L] - 50% off
[76]
October 7
2014
October 10
2014
VeigarSquare Baron Von Veigar [S|L] - 50% off
ViSquare Officer Vi [S|L] - 50% off
TristanaSquare Buccaneer Tristana [S|L] - 50% off
[77]
October 10
2014
October 13
2014
AnnieSquare Panda Annie [S|L] - 50% off
Lee SinSquare Acolyte Lee Sin [S|L] - 50% off
PoppySquare Battle Regalia Poppy [S|L] - 50% off
[78]
October 14
2014
October 17
2014
JinxSquare Mafia Jinx [S|L] - 50% off
SonaSquare Arcade Sona [S|L] - 50% off
RivenSquare Crimson Elite Riven [S|L] - 50% off
[79]
October 17
2014
October 20
2014
LuxSquare Steel Legion Lux [S|L] - 50% off
Twisted FateSquare Musketeer Twisted Fate [S|L] - 50% off
FizzSquare Atlantean Fizz [S|L] - 50% off
[80]
October 21
2014
October 24
2014
VayneSquare Heartseeker Vayne [S|L] - 50% off
RammusSquare Full Metal Rammus [S|L] - 50% off
TalonSquare Renegade Talon [S|L] - 50% off
[81]
October 24
2014
October 27
2014
TeemoSquare Panda Teemo [S|L] - 50% off
JaxSquare Temple Jax [S|L] - 50% off
MaokaiSquare Totemic Maokai [S|L] - 50% off
[82]
October 28
2014
October 31
2014
GangplankSquare Special Forces Gangplank [S|L] - 50% off
Xin ZhaoSquare Warring Kingdoms Xin Zhao [S|L] - 50% off
Miss FortuneSquare Road Warrior Miss Fortune [S|L] - 50% off
[83]
October 31
2014
November 3
2014
LuluSquare Bittersweet Lulu [S|L] - 50% off
TryndamereSquare Viking Tryndamere [S|L] - 50% off
LeonaSquare Valkyrie Leona [S|L] - 50% off
[84]
November 4
2014
November 7
2014
CassiopeiaSquare Jade Fang Cassiopeia [S|L] - 50% off
Master YiSquare Headhunter Master Yi [S|L] - 50% off
AniviaSquare Bird of Prey Anivia [S|L] - 50% off
[85]
November 7
2014
November 10
2014
OriannaSquare Bladecraft Orianna [S|L] - 50% off
ShenSquare Blood Moon Shen [S|L] - 50% off
IreliaSquare Nightblade Irelia [S|L] - 50% off
[86]
November 11
2014
November 14
2014
GragasSquare Oktoberfest Gragas [S|L] - 50% off
XerathSquare Scorched Earth Xerath [S|L] - 50% off
Lee SinSquare Traditional Lee Sin [S|L] - 50% off
[87]
November 14
2014
November 17
2014
JayceSquare Debonair Jayce [S|L] - 50% off
NunuSquare Grungy Nunu [S|L] - 50% off
VeigarSquare Leprechaun Veigar [S|L] - 50% off
[88]
November 18
2014
November 21
2014
AkaliSquare Blood Moon Akali [S|L] - 50% off
ViSquare Neon Strike Vi [S|L] - 50% off
AlistarSquare Longhorn Alistar [S|L] - 50% off
[89]

References

LoL's Official Sales page
Skin Sales Super-Thread by Coreporeal