If you've heard about the Day-Z free zombie slaying mod you may be interested today's deal from Gamefly. The ArmA 2: Combined Operations (base game + operation arrowhead expansion) has all you need for the Day-Z mod at $11.99 - the lowest price ever seen by $1. Usually this sells for $30.
ArmA 2: Combined Operations (PC Download) — $11.99 at GameFly. Next best is $30.
The stand-alone Day-Z game is coming soon but hasn't had its release date announced yet... so it still makes sense to buy the ArmA 2 game and download the mod to fill the void.