To celebrate the new update, Nation Red is now on sale until Thursday, August 12th, 2010.

Horde rush? Yes. Online co-op? You bet. Now’s the perfect time to get yourself and your friend hooked in the all-new online co-op mode and enjoy the new weapon, perks, power-ups, and Achievements.

Source To celebrate the new update, Nation Red is now on sale until Thursday, August 12th, 2010.

Horde rush? Yes. Online co-op? You bet. Now’s the perfect time to get yourself and your friend hooked in the all-new online co-op mode and enjoy the new weapon, perks, power-ups, and Achievements.

Source