As per usual, League of Legends will be updating the Riot store with their skin and champion sale, this one being for the month of September.
While the following list has all of the champions listed with the amount of RP they cost, you can also buy them with IP. The skins are the only thing that is RP mandatory.
Champions
- Aatrox – 487 RP
- Anivia – 395 RP
- Brand – 440 RP
- Braum – 487 RP
- Caitlyn – 440 RP
- Cassiopeia – 440 RP
- Cho’Gath – 292 RP
- Draven – 487 RP
- Elise – 487 RP
- Evelynn – 292 RP
- Fiddlesticks – 292 RP
- Gnar – 487 RP
- Irelia – 440 RP
- Jarvan IV – 440 RP
- Kalista – 487 RP
- Katarina – 395 RP
- Lulu – 487 RP
- Lux – 395 RP
- Sejuani – 440 RP
- Shen – 395 RP
- Shyvana – 395 RP
- Swain – 440 RP
- Teemo – 292 RP
- Vel’Koz – 487 RP
- Vi – 487 RP
- Xerath – 440 RP
- Ziggs – 440 RP
Skins
- Bandito Fiddlesticks – 260 RP
- Cryocore Brand – 487 RP
- Debonair Ezreal – 375 RP
- Debonair Vi – 375 RP
- Dragonblade Talon – 487 RP
- Enchanted Galio – 260 RP
- Frozen Terror Nocturne – 487 RP
- Galactic Nasus – 260 RP
- Gangster Twitch – 487 RP
- General Wukong – 375 RP
- Gothic Orianna – 260 RP
- Guqin Sona – 487 RP
- Hextech Singed – 260 RP
- Hillbilly Gragas – 260 RP
- Kennen M.D. – 487 RP
- Mad Scientist Ziggs – 487 RP
- Ninja Rammus – 487 RP
- Nurse Akali – 487 RP
- Pharaoh Nidalee – 260 RP
- Phoenix Quinn – 487 RP
- Piltover Customs Blitzcrank – 675 RP
- Royal Shaco – 260 RP
- Scarlet Hammer Poppy – 487 RP
- Soulstealer Vladimir – 675 RP
- Temple Jax – 375 RP
- Totemic Maokai – 260 RP
- Void Fizz – 675 RP