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
Pre-Season Eight Season Eight
Early Sales


Period Sales Link
November 8
2013
November 11
2013
Graves JailbreakCircle Jailbreak Graves [S|L] - 50% off
Veigar VeigarGreybeardCircle Veigar Greybeard [S|L] - 50% off
Pantheon RuthlessCircle Ruthless Pantheon [S|L] - 50% off
[1]
November 12
2013
November 15
2013
Varus BlightCrystalCircle Blight Crystal Varus [S|L] - 50% off
Lulu DragonTrainerCircle Dragon Trainer Lulu [S|L] - 50% off
Xin Zhao CommandoCircle Commando Xin Zhao [S|L] - 50% off
[2]
November 15
2013
November 18
2013
Irelia InfiltratorCircle Infiltrator Irelia [S|L] - 50% off
Xerath RunebornCircle Runeborn Xerath [S|L] - 50% off
Caitlyn ResistanceCircle Resistance Caitlyn [S|L] - 50% off
[3]
November 19
2013
November 22
2013
Nami KoiCircle Koi Nami [S|L] - 50% off
Singed AugmentedCircle Augmented Singed [S|L] - 50% off
Sion LumberjackCircle Lumberjack Sion [S|L] - 50% off
[4]
November 19
2013
November 26
2013
Flexible cost bundles:
1. The Bear Essentials bundle - 40% off, RP icon 2565 (RP icon 4242 with the champions):
Volibear RuneguardCircle Runeguard Volibear [S|L]
Sejuani BearCavalryCircle Bear Cavalry Sejuani [S|L]
Annie PandaCircle Panda Annie [S|L]
Teemo PandaCircle Panda Teemo [S|L]
2. Masters of Malpractice bundle - 30% off, RP icon 2047 (RP icon 3769 with the champions):
Shen SurgeonCircle Surgeon Shen [S|L]
Kennen KennenM.D.Circle Kennen M. D. [S|L]
Akali NurseCircle Nurse Akali [S|L]
3. Biker Boys bundle - 50% off, RP icon 1982 (RP icon 3945 with the champions):
Jax VandalCircle Vandal Jax [S|L]
Twitch VandalCircle Vandal Twitch [S|L]
Brand VandalCircle Vandal Brand [S|L]
Vladimir VandalCircle Vandal Vladimir [S|L]
Gragas VandalCircle Vandal Gragas [S|L]
4. Carry your carry bundle - 25% off, RP icon 3585:
ThreshSquare Thresh
ZyraSquare Zyra
NamiSquare Nami
LuluSquare Lulu
LeonaSquare Leona
[5]
November 22
2013
November 25
2013
Nunu DemolisherCircle Demolisher Nunu [S|L] - 50% off
Shen BloodMoonCircle Blood Moon Shen [S|L] - 50% off
Shaco RoyalCircle Royal Shaco [S|L] - 50% off
[6]
November 26
2013
November 29
2013
Draven SoulReaverCircle Soul Reaver Draven [S|L] - 50% off
Diana DarkValkyrieCircle Dark Valkyrie Diana [S|L] - 50% off
Talon RenegadeCircle Renegade Talon [S|L] - 50% off
[7]
November 29
2013
December 2
2013
Viktor FullMachineCircle Full Machine Viktor [S|L] - 50% off
Lux SpellthiefCircle Spellthief Lux [S|L] - 50% off
Vayne AristocratCircle Aristocrat Vayne [S|L] - 50% off
[8]
December 3
2013
December 6
2013
Tristana GuerillaCircle Guerilla Tristana [S|L] - 50% off
Wukong VolcanicCircle Volcanic Wukong [S|L] - 50% off
Garen CommandoCircle Commando Garen [S|L] - 50% off
[9]
December 6
2013
December 9
2013
Vi NeonStrikeCircle Neon Strike Vi [S|L] - 50% off
Lee Sin AcolyteCircle Acolyte Lee Sin [S|L] - 50% off
Cassiopeia DesperadaCircle Desperada Cassiopeia [S|L] - 50% off
[10]
December 10
2013
December 13
2013
Warwick FirefangCircle Firefang Warwick [S|L] - 50% off
Xerath ScorchedEarthCircle Scorched Earth Xerath [S|L] - 50% off
Corki HotRodCircle Hot Rod Corki [S|L] - 50% off
[11]
December 13
2013
December 16
2013
Soraka DivineCircle Divine Soraka [S|L] - 50% off
Jax TempleCircle Temple Jax [S|L] - 50% off
Cho'Gath LochNessCircle Loch Ness Cho'Gath [S|L] - 50% off
[12]
December 17
2013
December 20
2013
Janna FrostQueenCircle Frost Queen Janna [S|L] - 50% off
Annie FrostfireCircle Frostfire Annie [S|L] - 50% off
Ezreal FrostedCircle Frosted Ezreal [S|L] - 50% off
[13]
December 20
2013
December 23
2013
Kennen ArcticOpsCircle Arctic Ops Kennen [S|L] - 50% off
Fizz TundraCircle Tundra Fizz [S|L] - 50% off
Olaf GlacialCircle Glacial Olaf [S|L] - 50% off
[14]
December 24
2013
December 27
2013
Rumble RumbleintheJungleCircle Rumble in the Jungle [S|L] - 50% off
Jayce FullMetalCircle Full Metal Jayce [S|L] - 50% off
Riven CrimsonEliteCircle Crimson Elite Riven [S|L] - 50% off
[15]
December 27
2013
December 30
2013
Gragas Gragas,Esq.Circle Gragas, Esq. [S|L] - 50% off
Nunu GrungyCircle Grungy Nunu [S|L] - 50% off
Zilean GroovyCircle Groovy Zilean [S|L] - 50% off
[16]
December 31
2013
January 3
2014
Kassadin HarbingerCircle Harbinger Kassadin [S|L] - 50% off
Malzahar OverlordCircle Overlord Malzahar [S|L] - 50% off
Mordekaiser InfernalCircle Infernal Mordekaiser [S|L] - 50% off
[17]
January 3
2014
January 6
2014
Cassiopeia MythicCircle Mythic Cassiopeia [S|L] - 50% off
Sion BarbarianCircle Barbarian Sion [S|L] - 50% off
Gangplank SpookyCircle Spooky Gangplank [S|L] - 50% off
[18]
January 7
2014
January 10
2014
Teemo PandaCircle Panda Teemo [S|L] - 50% off
Blitzcrank PiltoverCustomsCircle Piltover Customs Blitzcrank [S|L] - 50% off
Brand VandalCircle Vandal Brand [S|L] - 50% off
[19]
January 10
2014
January 13
2014
Corki UrfriderCircle Urfrider Corki [S|L] - 50% off
Rammus ChromeCircle Chrome Rammus [S|L] - 50% off
Jax VandalCircle Vandal Jax [S|L] - 50% off
[20]

References

Skin Sales Super-Thread by Coreporeal