This weekend's biggest savings come in the form of getting the definitive editions of both Arkham games for 75% off. This takes Arkham Asylum down to $5, while Arkham City will only set you back $7.50. This means that for a mere $12.50, you can get two of the best games of the past five years. Heck, just the DLC for the games would normally set you back more than the full games will cost you now. This is an unbeatable deal if you haven't played them, or even if you have the console versions and just want the definitive versions on PC that will look better than consoles if you've got a great setup.