check out the sale currently going on at Amazon. It's pretty simple: Buy three games and you'll get the cheapest one free. Over 380 games are included in the sale, representing every major console. Highlights include Vanquish, Need for Speed: Hot Pursuit, Dead Rising 2, Gran Turismo 5, Ghost Trick and more.
As a willpower exercise, head over to Amazon and try not to press that "add to cart" button.