You can now preorder your copy of GTA V, and enter to win a Los Santos photo viewer in a new Twitter contest.

To preorder Grand Theft Auto V at GameStop, click here. You can also register to win one of 100 sets of five Limited Edition Los Santos Photo Viewers (pictured above). According to GameStop, the viewers feature "photos of Los Santos, including of the Vespucci Canals, Grapeseed, and the Del Perro Pier."

To register to win, follow @GameStop on Twitter. Then, you must retweet this GameStop tweet which shows a GTA postcard.

[Full disclosure: GameStop is the parent company of Game Informer]