Pre-order Left 4 Dead 2, receive in-game bat

Left 4 Dead 2 has ten all new melee weapons when compared to its precedessor. Obtaining one of them, the American baseball bat, can only be obtaining through pre-ordering the game at GameStop. If you pre-order now, you’ll also receive $5 off the game.

That’s a nice pre-order bonus and all, but if there’s ten new melee weapons in the game, why is it that one is only obtainable through GameStop pre-orders?

Left 4 Dead 2 [GameStop]