If you pre-order it at GameStop, you are automatically upgraded to the Special Edition, which is limited.
Special Edition Includes:
THE DEADLY ASSASSIN OUTFIT John Marston’s “Deadly Assassin” outfit causes your Dead Eye to regenerate at twice the speed.
THE ORIGINAL GAME SOUNDTRACK The original score composed by the critically acclaimed recording artists Bill Elm and Woody Jackson.
AND EXCLUSIVE CHALLENGES
Pre-order Red Dead Redemption at Amazon and get a $20 Amazon.com Gift Card. Additionally you'll receive access to an Amazon exclusive in-game golden guns weapon pack.
Best Buy will give you a free War Horse download.