Lock and load and prepare to ship out because Call of Duty 4: Modern Warfare Variety Map Pack hits half-price on Playstation Network for a limited time.  Starting Sept. 18 (2:00 pm/PDT) and running through 2:00 pm/PDT on Sept. 25, Activision Inc.’s (Nasdaq: ATVI) blockbuster DLC by Infinity Ward will be available for $4.99, down from $9.99 in America only at the present time.

As part of the limited time offer, Playstation Network will also host a Double XP Weekend, allowing players to earn twice as much XP.  Members of Infinity Ward will also be online between noon – 4:00 pm/PDT on Friday, September 19 to play with fans on what has become the number one-selling DLC on Playstation Network.  While online, players should be sure to add the following Infinity Ward PSN tags to their friends list:

The Call of Duty 4: Modern Warfare Variety Map Pack includes an adrenaline-pumping four Modern Warfare maps.

“Broadcast” features tight corridors and wide open parking lots where large groups utilize strategic maneuvers through close-quarter fighting.

“Chinatown” delivers the action by the full moon against a backdrop of brightly colored lamps, antique shops and neon signs of the local district.

“Killhouse” is a desolate warehouse under enemy attack where squads must move from building to building to full take control of the combat .

“Creek” is a large open village nestled in a heavily wooded area, where games will fight between high ridgelines and deep in underground caves.