There's the massive Xbox Live games sale happening at the moment and Resident Evil 6 is listed as being just $9.95 on here:
Search Results - Resident Evil - Xbox.com - Xbox.com
No Hope Left
Resident Evil 6 is set in 2013, 10 years after the Raccoon City incident. The world is in turmoil as the C-virus has reached pandemic proportions and threatens to consume the world in a horrific end of days scenario. Under the threat of this global bioterrorist attack, our heroes battle to save the world in a story of fear on an unprecedented scale.
New Game Add-On Modes
Get the 3 new game add-on modes for Resident Evil 6 first on Xbox at the value price of 720 MS Points. Pack includes:
ONSLAUGHT: In this one-on-one version of The Mercenaries, rack up combo points to send hordes of creatures your opponentís way.
SURVIVORS: Itís a battle between agents, and only the last man standing can be the victor. This mode supports up to 6-players in individual deathmatch, or team battles.
PREDATOR: Become the tracker Ustanak as you hunt down agents. This battle of agents versus Ustanak can be waged with up to 6 players.