Amazon has XCOM for XBox 360 on sale for $25. Averages 4.5 stars on Amazon. PS3 version is also on sale for $35.
XCOM: Enemy Unknown is a re-imagining of X-COM, the classic strategy game from 1993, and developed by the award-winning creators of Civilization. You will control the fate of the human race by creating and managing a fully operational base, researching alien technologies, planning combat missions and controlling soldier movement in battle.