Which League of Legends skins are currently on sale?

Which League of Legends skins are currently on sale in the store? LoL is a free-to-play game in the truest sense - you can enjoy everything the MOBA offers for absolutely nothing. Now if you were to ask a seasoned League player if that were true, they’d probably have to stifle a few tears as they check how much their bank account has suffered buying skins since they started battling on the Rift.Riot rotates a series of skins in the store, with the savviest of us holding out until the cosmetic...