Kmart has both versions of Dead Space for $9.99
Best Buy has both versions of Assassin's Creed: Brotherhood and Medal of Honor for $39.99
Best Buy is also offering $10 off when you buy two select Kinect games or $20 when you buy three. The eligible games are: Game Party: In Motion, Deca Sports Collection, Dance Central, Kinect Sports, Sonic Free Riders, Your Shape: Fitness Evolved, Motion Sports: Play for Real, and Zumba Fitness Party.