$20 off Halo 4 ($39.99)

Retailer: Best Buy

Platforms: Xbox 360

Link: http://bit.ly/Sp84V3 

If you're the kind of guy who's already saddled with a stack of Halo-branded crap, then this deal probably won't mean much to you. For the rest of us however, it's a pretty sweet offer for one of our most favorably reviewed 360 games of the year. Now's not such a bad time to hop in either as the Spartan Ops mode is expanding and we've been given a peek at the next handful of free co-op missions; they lookin' good. If that wasn't enough to convince you, consider that the $20 saved could go towards the War Games Map Pass, which would give you access to the recently released Crimson map and more as they get released.