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 13
2015
November 16
2015
Nasus PharaohCircle Pharaoh Nasus [S|L] - 50% off
Taric ArmoroftheFifthAgeCircle Armor of the Fifth Age Taric [S|L] - 50% off
Master Yi IoniaCircle Ionia Master Yi [S|L] - 50% off
Akali SilverfangCircle Silverfang Akali [S|L] - 50% off
[1]
November 17
2015
November 20
2015
Evelynn ShadowCircle Shadow Evelynn [S|L] - 50% off
Jarvan IV DragonslayerCircle Dragonslayer Jarvan IV [S|L] - 50% off
Ahri DynastyCircle Dynasty Ahri [S|L] - 50% off
Urgot BattlecastCircle Battlecast Urgot [S|L] - 50% off
[2]
November 20
2015
November 23
2015
Lee Sin TraditionalCircle Traditional Lee Sin [S|L] - 50% off
Volibear NorthernStormCircle Northern Storm Volibear [S|L] - 50% off
Renekton PoolPartyCircle Pool Party Renekton [S|L] - 50% off
Kha'Zix GuardianoftheSandsCircle Guardian of the Sands Kha'Zix [S|L] - 50% off
[3]
November 24
2015
November 27
2015
Yorick UndertakerCircle Undertaker Yorick [S|L] - 50% off
Graves MafiaCircle Mafia Graves [S|L] - 50% off
Sejuani DarkriderCircle Darkrider Sejuani [S|L] - 50% off
Aatrox MechaCircle Mecha Aatrox [S|L] - 50% off
[4]
November 27
2015
November 30
2015
Lux SorceressCircle Sorceress Lux [S|L] - 50% off
Sivir BanditCircle Bandit Sivir [S|L] - 50% off
Nidalee HeadhunterCircle Headhunter Nidalee [S|L] - 50% off
Elise DeathBlossomCircle Death Blossom Elise [S|L] - 50% off
[5]
December 1
2015
December 4
2015
Garen SanguineCircle Sanguine Garen [S|L] - 50% off
Rammus ChromeCircle Chrome Rammus [S|L] - 50% off
Kog'Maw DeepSeaCircle Deep Sea Kog'Maw [S|L] - 50% off
Ziggs PoolPartyCircle Pool Party Ziggs [S|L] - 50% off
[6]
December 3
2015
December 7
2015
Ezreal AceofSpadesCircle Ace of Spades Ezreal [S|L] - 31% off
Nasus ArchdukeCircle Archduke Nasus [S|L] - 31% off
Vayne ArclightCircle Arclight Vayne [S|L] - 23% off
Zilean BloodMoonCircle Blood Moon Zilean [S|L] - 23% off
Galio DebonairCircle Debonair Galio [S|L] - 31% off
Udyr DefinitelyNotCircle Definitely Not Udyr [S|L] - 23% off
Bard ElderwoodCircle Elderwood Bard [S|L] - 23% off
Jinx FirecrackerCircle Firecracker Jinx [S|L] - 28% off
Jayce ForsakenCircle Forsaken Jayce [S|L] - 28% off
Rammus GuardianoftheSandsCircle Guardian of the Sands Rammus [S|L] - 23% off
Skarner GuardianoftheSandsCircle Guardian of the Sands Skarner [S|L] - 23% off
Xerath GuardianoftheSandsCircle Guardian of the Sands Xerath [S|L] - 28% off
Akali HeadhunterCircle Headhunter Akali [S|L] - 28% off
Varus HeartseekerCircle Heartseeker Varus [S|L] - 28% off
Mordekaiser KingofClubsCircle King of Clubs Mordekaiser [S|L] - 31% off
Ashe MarauderCircle Marauder Ashe [S|L] - 31% off
Warwick MarauderCircle Marauder Warwick [S|L] - 31% off
Ziggs MasterArcanistCircle Master Arcanist Ziggs [S|L] - 28% off
Soraka OrderoftheBananaCircle Order of the Banana Soraka [S|L] - 31% off
Syndra QueenofDiamondsCircle Queen of Diamonds Syndra [S|L] - 31% off
Fiddlesticks RisenCircle Risen Fiddlesticks [S|L] - 28% off
Ekko SandstormCircle Sandstorm Ekko [S|L] - 23% off
Xin Zhao SecretAgentCircle Secret Agent Xin Zhao [S|L] - 23% off
Lux StarGuardianCircle Star Guardian Lux [S|L] - 28% off
Amumu SurprisePartyCircle Surprise Party Amumu [S|L] - 28% off
Annie SweetheartCircle Sweetheart Annie [S|L] - 31% off
Nami UrftheNami-teeCircle Urf the Nami-tee [S|L] - 31% off
Nautilus WardenCircle Warden Nautilus [S|L] - 31% off
Sivir WardenCircle Warden Sivir [S|L] - 31% off
Katarina WarringKingdomsCircle Warring Kingdoms Katarina [S|L] - 23% off
Nidalee WarringKingdomsCircle Warring Kingdoms Nidalee [S|L] - 23% off
Shaco WildCardCircle Wild Card Shaco [S|L] - 31% off
[7]
December 4
2015
December 7
2015
Gangplank MinutemanCircle Minuteman Gangplank [S|L] - 50% off
Twitch PickpocketCircle Pickpocket Twitch [S|L] - 50% off
Sona PentakillCircle Pentakill Sona [S|L] - 50% off
Zilean ShurimaDesertCircle Shurima Desert Zilean [S|L] - 50% off
[8]
December 8
2015
December 11
2015
Anivia BirdofPreyCircle Bird of Prey Anivia [S|L] - 50% off
Kayle BattlebornCircle Battleborn Kayle [S|L] - 50% off
Janna HextechCircle Hextech Janna [S|L] - 50% off
Lulu DragonTrainerCircle Dragon Trainer Lulu [S|L] - 50% off
[9]
December 11
2015
December 14
2015
Ashe SherwoodForestCircle Sherwood Forest Ashe [S|L] - 50% off
Trundle ConstableCircle Constable Trundle [S|L] - 50% off
Mordekaiser PentakillCircle Pentakill Mordekaiser [S|L] - 50% off
Annie ReverseCircle Reverse Annie [S|L] - 50% off
[10]
December 14
2015
December 19
2015
2015 All-Star Event Bundles (flexible cost):
1. All-Star 1v1 Champion Bundle - 50% off, RP icon 2399 (RP icon 4787 with the champions):
Draven PoolPartyCircle Pool Party Draven [S|L]
Lucian StrikerCircle Striker Lucian [S|L]
Ezreal TPACircle TPA Ezreal [S|L]
Zed ShockbladeCircle Shockblade Zed [S|L]
Vel'Koz BattlecastCircle Battlecast Vel'Koz [S|L]
2. All-Star Winner's Bundle - 50% off, RP icon 2699 (RP icon 5042 with the champions):
Lissandra BladeQueenCircle Blade Queen Lissandra [S|L]
Elise BloodMoonCircle Blood Moon Elise [S|L]
Zed SKTT1Circle SKT T1 Zed [S|L]
Kalista BloodMoonCircle Blood Moon Kalista [S|L]
Blitzcrank iBlitzcrankCircle iBlitzcrank [S|L]
2. All-Star Playmaker's Bundle - 50% off, RP icon 2211 (RP icon 4047 with the champions):
Azir GalacticCircle Galactic Azir [S|L]
Sivir WardenCircle Warden Sivir [S|L]
Gnar GentlemanCircle Gentleman Gnar [S|L]
Janna FnaticCircle Fnatic Janna [S|L]
Riven BattleBunnyCircle Battle Bunny Riven [S|L]
[11]
December 15
2015
December 18
2015
Olaf ForsakenCircle Forsaken Olaf [S|L] - 50% off
Amumu LittleKnightCircle Little Knight Amumu [S|L] - 50% off
Zac SpecialWeaponCircle Special Weapon Zac [S|L] - 50% off
Malphite MechaCircle Mecha Malphite [S|L] - 50% off
[12]
December 16
2015
December 16
2015
Anivia NoxusHunterCircle Noxus Hunter Anivia [S|L] - 50% off
Viktor PrototypeCircle Prototype Viktor [S|L] - 50% off
Teemo ReconCircle Recon Teemo [S|L] - 50% off
Tristana FirefighterCircle Firefighter Tristana [S|L] - 50% off
Gragas ScubaCircle Scuba Gragas [S|L] - 50% off
Miss Fortune SecretAgentCircle Secret Agent Miss Fortune [S|L] - 50% off
[13]
December 17
2015
December 17
2015
Karma SunGoddessCircle Sun Goddess Karma [S|L] - 50% off
Lux ImperialCircle Imperial Lux [S|L] - 50% off
Akali StingerCircle Stinger Akali [S|L] - 50% off
Shen FrozenCircle Frozen Shen [S|L] - 50% off
Kennen SwampMasterCircle Swamp Master Kennen [S|L] - 50% off
[14]
December 18
2015
December 18
2015
Alistar MatadorCircle Matador Alistar [S|L] - 50% off
Zilean TimeMachineCircle Time Machine Zilean [S|L] - 50% off
Teemo BadgerCircle Badger Teemo [S|L] - 50% off
Malphite CoralReefCircle Coral Reef Malphite [S|L] - 50% off
Caitlyn SheriffCircle Sheriff Caitlyn [S|L] - 50% off
Gragas VandalCircle Vandal Gragas [S|L] - 50% off
[15]
December 18
2015
December 21
2015
Karthus StatueofKarthusCircle Statue of Karthus [S|L] - 50% off
Xerath RunebornCircle Runeborn Xerath [S|L] - 50% off
Teemo CottontailCircle Cottontail Teemo [S|L] - 50% off
Veigar SuperbVillainCircle Superb Villain Veigar [S|L] - 50% off
[16]
December 19
2015
December 19
2015
Corki RedBaronCircle Red Baron Corki [S|L] - 50% off
Miss Fortune RoadWarriorCircle Road Warrior Miss Fortune [S|L] - 50% off
Irelia InfiltratorCircle Infiltrator Irelia [S|L] - 50% off
Vladimir VandalCircle Vandal Vladimir [S|L] - 50% off
Akali CrimsonCircle Crimson Akali [S|L] - 50% off
Tristana GuerillaCircle Guerilla Tristana [S|L] - 50% off
[17]
December 20
2015
December 20
2015
Malphite ObsidianCircle Obsidian Malphite [S|L] - 50% off
Ezreal NottinghamCircle Nottingham Ezreal [S|L] - 50% off
Sivir SpectacularCircle Spectacular Sivir [S|L] - 50% off
Mordekaiser DragonKnightCircle Dragon Knight Mordekaiser [S|L] - 50% off
Amumu Almost-PromKingCircle Almost-Prom King Amumu [S|L] - 50% off
Amumu PharaohCircle Pharaoh Amumu [S|L] - 50% off
[18]
December 21
2015
December 21
2015
Tryndamere HighlandCircle Highland Tryndamere [S|L] - 50% off
Brand VandalCircle Vandal Brand [S|L] - 50% off
Poppy BlacksmithCircle Blacksmith Poppy [S|L] - 50% off
Ashe FreljordCircle Freljord Ashe [S|L] - 50% off
Morgana SinfulSucculenceCircle Sinful Succulence Morgana [S|L] - 50% off
Xin Zhao WingedHussarCircle Winged Hussar Xin Zhao [S|L] - 50% off
[19]
December 22
2015
December 22
2015
Annie AnnieinWonderlandCircle Annie in Wonderland [S|L] - 50% off
Shaco WorkshopCircle Workshop Shaco [S|L] - 50% off
Tryndamere VikingCircle Viking Tryndamere [S|L] - 50% off
Corki HotRodCircle Hot Rod Corki [S|L] - 50% off
Twitch KingpinCircle Kingpin Twitch [S|L] - 50% off
Dr. Mundo ExecutionerMundoCircle Executioner Mundo [S|L] - 50% off
[20]
December 22
2015
December 25
2015
Heimerdinger BlastZoneCircle Blast Zone Heimerdinger [S|L] - 50% off
Vayne HeartseekerCircle Heartseeker Vayne [S|L] - 50% off
Dr. Mundo RagebornMundoCircle Rageborn Mundo [S|L] - 50% off
Miss Fortune ArcadeCircle Arcade Miss Fortune [S|L] - 50% off
[21]
December 23
2015
December 23
2015
Morgana ExiledCircle Exiled Morgana [S|L] - 50% off
Kog'Maw CaterpillarCircle Caterpillar Kog'Maw [S|L] - 50% off
Ashe QueenCircle Queen Ashe [S|L] - 50% off
Renekton GalacticCircle Galactic Renekton [S|L] - 50% off
Vayne VindicatorCircle Vindicator Vayne [S|L] - 50% off
Cho'Gath NightmareCircle Nightmare Cho'Gath [S|L] - 50% off
[22]
December 24
2015
December 24
2015
Olaf GlacialCircle Glacial Olaf [S|L] - 50% off
Sona MuseCircle Muse Sona [S|L] - 50% off
Vladimir CountCircle Count Vladimir [S|L] - 50% off
Fiddlesticks FiddleMeTimbersCircle Fiddle Me [S|L] - 50% off
Nocturne VoidCircle Void Nocturne [S|L] - 50% off
Gangplank SailorCircle Sailor Gangplank [S|L] - 50% off
[23]
December 25
2015
December 25
2015
Renekton RuneWarsCircle Rune Wars Renekton [S|L] - 50% off
Leona DefenderCircle Defender Leona [S|L] - 50% off
Rumble BilgeratCircle Bilgerat Rumble [S|L] - 50% off
Poppy NoxusCircle Noxus Poppy [S|L] - 50% off
Heimerdinger AlienInvaderCircle Alien Invader Heimerdinger [S|L] - 50% off
Ryze ProfessorCircle Professor Ryze [S|L] - 50% off
[24]
December 25
2015
December 28
2015
Renekton OutbackCircle Outback Renekton [S|L] - 50% off
Volibear CaptainCircle Captain Volibear [S|L] - 50% off
Jayce DebonairCircle Debonair Jayce [S|L] - 50% off
Lee Sin DragonFistCircle Dragon Fist Lee Sin [S|L] - 50% off
[25]
December 26
2015
December 26
2015
Twisted Fate TheMagnificentCircle The Magnificent Twisted Fate [S|L] - 50% off
Kennen DeadlyCircle Deadly Kennen [S|L] - 50% off
Graves JailbreakCircle Jailbreak Graves [S|L] - 50% off
Ezreal ExplorerCircle Explorer Ezreal [S|L] - 50% off
Pantheon RuthlessCircle Ruthless Pantheon [S|L] - 50% off
Alistar LonghornCircle Longhorn Alistar [S|L] - 50% off
[26]
December 27
2015
December 27
2015
Karthus PhantomCircle Phantom Karthus [S|L] - 50% off
Singed MadScientistCircle Mad Scientist Singed [S|L] - 50% off
Annie RedRidingCircle Red Riding Annie [S|L] - 50% off
Caitlyn SafariCircle Safari Caitlyn [S|L] - 50% off
Kassadin DeepOneCircle Deep One Kassadin [S|L] - 50% off
Nunu SasquatchCircle Sasquatch Nunu [S|L] - 50% off
[27]
December 28
2015
December 28
2015
Udyr PrimalCircle Primal Udyr [S|L] - 50% off
Jax VandalCircle Vandal Jax [S|L] - 50% off
Kayle UnmaskedCircle Unmasked Kayle [S|L] - 50% off
Shen YellowJacketCircle Yellow Jacket Shen [S|L] - 50% off
Dr. Mundo ToxicCircle Toxic Dr. Mundo [S|L] - 50% off
Jax AnglerCircle Angler Jax [S|L] - 50% off
[28]
December 29
2015
December 29
2015
Ziggs MajorCircle Major Ziggs [S|L] - 50% off
Sion HextechCircle Hextech Sion [S|L] - 50% off
Pantheon PerseusCircle Perseus Pantheon [S|L] - 50% off
Warwick FeralCircle Feral Warwick [S|L] - 50% off
Malzahar VizierCircle Vizier Malzahar [S|L] - 50% off
Evelynn MasqueradeCircle Masquerade Evelynn [S|L] - 50% off
[29]
December 29
2015
January 1
2016
Master Yi SamuraiYiCircle Samurai Yi [S|L] - 50% off
Evelynn SafecrackerCircle Safecracker Evelynn [S|L] - 50% off
Katarina SandstormCircle Sandstorm Katarina [S|L] - 50% off
Blitzcrank iBlitzcrankCircle iBlitzcrank [S|L] - 50% off
[30]
December 30
2015
December 30
2015
Kog'Maw SonoranCircle Sonoran Kog'Maw [S|L] - 50% off
Malphite MarbleCircle Marble Malphite [S|L] - 50% off
Malphite ShamrockCircle Shamrock Malphite [S|L] - 50% off
Annie PromQueenCircle Prom Queen Annie [S|L] - 50% off
Galio HextechCircle Hextech Galio [S|L] - 50% off
Urgot ButcherCircle Butcher Urgot [S|L] - 50% off
[31]
December 31
2015
December 31
2015
Twitch VandalCircle Vandal Twitch [S|L] - 50% off
Janna TempestCircle Tempest Janna [S|L] - 50% off
Ryze TribalCircle Tribal Ryze [S|L] - 50% off
Garen DesertTrooperCircle Desert Trooper Garen [S|L] - 50% off
Sejuani SabretuskCircle Sabretusk Sejuani [S|L] - 50% off
Veigar BaronVonCircle Baron Von Veigar [S|L] - 50% off
[32]
January 1
2016
January 1
2016
Warwick BigBadCircle Big Bad Warwick [S|L] - 50% off
Taric EmeraldCircle Emerald Taric [S|L] - 50% off
Rammus MoltenCircle Molten Rammus [S|L] - 50% off
Nidalee LeopardCircle Leopard Nidalee [S|L] - 50% off
Xin Zhao VisceroCircle Viscero Xin Zhao [S|L] - 50% off
Dr. Mundo Mr.MundoverseCircle Mr. Mundoverse [S|L] - 50% off
[33]
January 1
2016
January 4
2016
Ryze UncleCircle Uncle Ryze [S|L] - 50% off
Ahri MidnightCircle Midnight Ahri [S|L] - 50% off
Singed AugmentedCircle Augmented Singed [S|L] - 50% off
Cassiopeia JadeFangCircle Jade Fang Cassiopeia [S|L] - 50% off
[34]
January 5
2016
January 8
2016
Galio CommandoCircle Commando Galio [S|L] - 50% off
Rammus FullMetalCircle Full Metal Rammus [S|L] - 50% off
Varus ArclightCircle Arclight Varus [S|L] - 50% off
Jarvan IV WarringKingdomsCircle Warring Kingdoms Jarvan IV [S|L] - 50% off
[35]
January 8
2016
January 1
2016
Nocturne RavagerCircle Ravager Nocturne [S|L] - 50% off
Twisted Fate RedCardCircle Red Card Twisted Fate [S|L] - 50% off
Tryndamere SultanCircle Sultan Tryndamere [S|L] - 50% off
Leona IronSolariCircle Iron Solari Leona [S|L] - 50% off
[36]
January 12
2016
January 15
2016
Sivir WarriorPrincessCircle Warrior Princess Sivir [S|L] - 50% off
Brand ApocalypticCircle Apocalyptic Brand [S|L] - 50% off
Aatrox JusticarCircle Justicar Aatrox [S|L] - 50% off
Swain TyrantCircle Tyrant Swain [S|L] - 50% off
[37]
January 15
2016
January 18
2016
LeBlanc PrestigiousCircle Prestigious LeBlanc [S|L] - 50% off
Shyvana IronscaleCircle Ironscale Shyvana [S|L] - 50% off
Nami KoiCircle Koi Nami [S|L] - 50% off
Darius BioforgeCircle Bioforge Darius [S|L] - 50% off
[38]

References

LoL's Official Sales page