$20 Off Halo 4 ($39.99)
Platforms: Xbox 360
Whether you appreciate the franchise's lore or not, there's no denying that the multiplayer package offered in Halo 4 is quite possibly the most inclusive on the market right now. You've got access to a whole plethora of modes and maps, plus new content on the regular thanks to the weekly Spartan Ops series that gives free co-op missions. Not a bad investment, especially with the discount.