"Grab the League of Legends Starter Pack for free at Amazon!
In addition, they are offering a Limited time, Amazon-exclusive offer:
Receive a free Starter Pack including these 8 free Champions starting January 22, 2016 through 11:59 PM, February 4, 2016 when you link your Amazon and League of Legends accounts. Starter Pack champions will be automatically applied to your League of Legends account, and appear in your Champions library. On the top right-hand side of your League of Legends account, you will find your IP boosts and XP boosts."