Rockstar make some great games including the GTA series and the Manhunt series.
You can get 50% off them all at the moment on Amazon.com
Prices include:
GTA 4 complete(Steam) - $14.99 USD
>Join the Official Rockstar Games Community on Steam at http://steamcommunity.com/games/rockstargames by 10 am Pacific Time on Tuesday, May 15, 2012, and receive one non-giftable copy of Midnight Club