THQ and Volition unveiled the inevitable Red Faction Armageddon retailer-specific pre-order bonuses today.
In addition, GameStop pre-orders will get the Commando Pack, which includes a uniform, Plasma Thrower (to "spray an unforgiving stream of destruction"), and dual Laser Pistols. Speaking of virtual goods, Best Buy orders get a Recon pack: a recon uniform for snipers and spies, the Arc Welder, and the XNG-5000 -- the latter of which seeks out enemies and dissolves them. I think I've had nightmares like that.
Walmart is the only retailer giving out a physical item: a comic book prequel to the events of Armageddon. The book also includes a "mini-strategy guide" for the game.