PlayStation 3 and Xbox 360 owners can get their four player co-op zombie on this week for half the price in Call of Duty: World at War. All three map packs are 50% off this week. That gets you the three co-op maps: Der Riese, Shi No Numa, and Verruckt - quite the bargain. Oh sure, you also get almost a dozen other multiplayer maps, but you want to kill zombies. We know it.
So while everyone else is playing the Left 4 Dead 2 demo today because you didn't preorder, you won't feel completely left out. You'll still do your part to find back the impending zombie horde. 360 owners and queue their download here, PS3 owners hit up the PlayStation store.