Activision has announced the Variety Map Pack and multiplayer arenas will sell for 400 Microsoft Points ($5) on the Xbox Live Marketplace this weekend.
The half price sale will run till midnight on Monday, September 15th. In addition to the reduced cost, this time will also be part of a Double XP weekend for online players.
Released earlier this year for the Playstation 3 and Xbox 360 at $10, the Variety Map Pack included four extra maps. A free PC release followed in June.