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
November 21
2014
November 24
2014
SingedSquare.png Augmented Singed [S|L] - 50% off
LuxSquare.png Spellthief Lux [S|L] - 50% off
GravesSquare.png Hired Gun Graves [S|L] - 50% off
[1]
November 25
2014
November 28
2014
VayneSquare.png Dragonslayer Vayne [S|L] - 50% off
SejuaniSquare.png Bear Cavalry Sejuani [S|L] - 50% off
RammusSquare.png Freljord Rammus [S|L] - 50% off
[2]
November 28
2014
December 1
2014
Xin ZhaoSquare.png Winged Hussar Xin Zhao [S|L] - 50% off
PantheonSquare.png Perseus Pantheon [S|L] - 50% off
ShyvanaSquare.png Boneclaw Shyvana [S|L] - 50% off
[3]
December 2
2014
December 5
2014
TryndamereSquare.png Sultan Tryndamere [S|L] - 50% off
SyndraSquare.png Justicar Syndra [S|L] - 50% off
WarwickSquare.png Big Bad Warwick [S|L] - 50% off
[4]
December 5
2014
December 8
2014
EliseSquare.png Death Blossom Elise [S|L] - 50% off
GarenSquare.png Rugged Garen [S|L] - 50% off
TrundleSquare.png Lil' Slugger Trundle [S|L] - 50% off
[5]
December 9
2014
December 12
2014
AnnieSquare.png Reverse Annie [S|L] - 50% off
Jarvan IVSquare.png Warring Kingdoms Jarvan IV [S|L] - 50% off
NasusSquare.png Pharaoh Nasus [S|L] - 50% off
[6]
December 12
2014
December 15
2014
ZyraSquare.png Wildfire Zyra [S|L] - 50% off
WukongSquare.png General Wukong [S|L] - 50% off
Master YiSquare.png Chosen Master Yi [S|L] - 50% off
[7]
December 16
2014
December 19
2014
RengarSquare.png Headhunter Rengar [S|L] - 50% off
PantheonSquare.png Full Metal Pantheon [S|L] - 50% off
ShacoSquare.png Royal Shaco [S|L] - 50% off
[8]
December 19
2014
December 22
2014
RenektonSquare.png Bloodfury Renekton [S|L] - 50% off
MorganaSquare.png Blade Mistress Morgana [S|L] - 50% off
OriannaSquare.png Gothic Orianna [S|L] - 50% off
[9]
December 23
2014
December 26
2014
Lee SinSquare.png Dragon Fist Lee Sin [S|L] - 50% off
NautilusSquare.png AstroNautilus [S|L] - 50% off
NidaleeSquare.png Pharaoh Nidalee [S|L] - 50% off
[10]
December 26
2014
December 29
2014
AhriSquare.png Popstar Ahri [S|L] - 50% off
LeonaSquare.png Defender Leona [S|L] - 50% off
ZileanSquare.png Groovy Zilean [S|L] - 50% off
[11]
December 30
2014
January 2
2015
GangplankSquare.png Sultan Gangplank [S|L] - 50% off
SorakaSquare.png Celestine Soraka [S|L] - 50% off
IreliaSquare.png Aviator Irelia [S|L] - 50% off
[12]
January 2
2015
January 5
2015
OlafSquare.png Pentakill Olaf [S|L] - 50% off
KarmaSquare.png Sun Goddess Karma [S|L] - 50% off
LuxSquare.png Commando Lux [S|L] - 50% off
[13]
January 6
2015
January 9
2015
KatarinaSquare.png Bilgewater Katarina [S|L] - 50% off
ViktorSquare.png Creator Viktor [S|L] - 50% off
Twisted FateSquare.png Jack of Hearts Twisted Fate [S|L] - 50% off
[14]
January 9
2015
January 12
2015
YorickSquare.png Pentakill Yorick [S|L] - 50% off
TaricSquare.png Armor of the Fifth Age Taric [S|L] - 50% off
GalioSquare.png Commando Galio [S|L] - 50% off
[15]
January 13
2015
January 16
2015
ShenSquare.png Warlord Shen [S|L] - 50% off
YasuoSquare.png High Noon Yasuo [S|L] - 50% off
UdyrSquare.png Black Belt Udyr [S|L] - 50% off
[16]
January 16
2015
January 19
2015
NamiSquare.png Koi Nami [S|L] - 50% off
VolibearSquare.png Northern Storm Volibear [S|L] - 50% off
Xin ZhaoSquare.png Imperial Xin Zhao [S|L] - 50% off
[17]
January 20
2015
January 23
2015
DravenSquare.png Gladiator Draven [S|L] - 50% off
GarenSquare.png Steel Legion Garen [S|L] - 50% off
VayneSquare.png Aristocrat Vayne [S|L] - 50% off
[18]

References

LoL's Official Sales page