If you haven't had a chance to pick up Dead Rising: Case Zero or Dead Rising: Case West, both games are available for 50% off if you are an Xbox Live Gold Member. Both Case Zero and Case West are standalone DLC games, so you do not need the Dead Rising 2 disc to play them.
If you own Dead Rising 2, the Psycho and Soldier skill packs are also half off. Both deals are only good until the end of the week. For those that have already purchased all of the games and DLC, remember that Capcom is working on Dead Rising 2: Off The Record, which will be out later this year.