They are giving $100 worth of prizes out which is split into 5 $20 lots. You can choose from Riot Points, Steam funds or Amazon gift cards. (I'm going to be choosing some Riot Points if I win for sure!)
Simple enough to enter (using the PunchTab giveaway thingy), just link email/Facebook for an entry and complete a few other tasks for points if you want more.
Is ending at the end of November, goodluck everyone!
Edit: There is a referral train is going in this thread. You get 5 bonus entries whenever someone uses your link to signup for the giveaway so please go to the bottom of the thread to use the last link and then post yours.