Steam always has great deals on games and here is a pretty good one for one the best games of the year, Deus Ex Human Revolution.
You have until Thursday the 20th to purchase Deus Ex Human Revolution 25% off sticker price on both the regular and Augmented Edition. Just know after 4pm Pacific time the deal is over.
Have you not played it? Then read the review on the highly rated game! I am personally going back to play it again because it is that good.