Warhammer 40k: Space Marine (69% Off)
Retailer: Greenman Gaming
Price: $9.00 (69% Off)
Say what you will about its linear nature, repetitive combat, and general lack of storyline, I loved this game. For nine bucks, getting to step inside the power armor of a Space Marine is a fair price, especially when you get right in the middle of some Ork slicing mayhem. It's fun, trust me.
Also note, you can get an additional 20% off using the code GMG20-PJFEW-Y16HK at checkout. This'll bring your total down to $7.20