Gamedealdaily.com has the MK vs DC Universe game for $39.95 as their deal of the day.  If you check out their store area you will find the PS3 version for the same price.  All used games come complete with the original case, artwork, manual, and game disc.

 Link: www.gamedealdaily.com

 Product description:

 When a cataclysmic force merges conquerors from two universes, conflict is inevitable. Kombat forces friends to fight, worlds to collide, and unlikely alliances to be forged. In order to save all they know, the heroes and villains of Mortal Kombat must wage war against the combined might of the DC Universe (DCU). How can either side prevail when rage blinds them to the dark threat poised to destroy them all? For the first time ever Scorpion, Sub Zero and the warriors from Midways billion-dollar fighting franchise face off against Batman, Superman and other iconic and powerful DC Super Heroes, featuring signature attacks for both sides and a unique and intertwining storyline, written as a collaboration between the Mortal Kombat creative team and top comic scribes Jimmy Palmiotti and Justin Gray. Choose your side and challenge your opponents with a new fighting system including Freefall Kombat and Klose Kombat along with dynamic multi-tiered environments. Plus, pick your favorite character from MK or DCU and pursue a fighting adventure in the new single player mode with an intertwined storyline and two unique perspectives.

[Submitted by drfrielgood, Thanks!]