Mark your calendars, as publisher Activision has announced that the Variety Map Pack for Call of Duty 4 and its additional multiplayer maps will sell for 400 Microsoft points, half its usual cost. This sale will be valid only this weekend.

The half-price sale will start 12.01am PDT on Friday, September 12 to midnight on Monday, September 14. To celebrate the sale, the weekend will also be host to a double XP weekend for online players.

The pack was released earlier this year on PS3 and Xbox 360 for $10, adding four new maps to the popular game. PC owners got it for free some time later.