There's a lot of co-op love in XBLA's Deal of the Week sale!  Four out of the five games feature co-op.  Hard Corps: Uprising, X-men Arcade, Lara Croft and the Guardian of Light, and Teenage Mutant Ninja Turtles: Turtles in Time Reshelled are all 50% off.  These four games have an average score of 4 out of 5 in our Co-Op reviews. Comic Jumper, and excellent single player game, is also for sale for half price.