Just pre order the Premium edition at Gamestop.
There are 2 special editions, Premium and Ultimate Songbird
Both come with the same items, except the Ultimate Songbird comes with a 9.75" Songbird statue
*A resin-cast Songbird statue measuring 9.75 inches and comes with its own collectible packaging (Ultimate Songbird Edition only)
*The BioShock Infinite game
*A 3-inch baby version keychain of the sold-out Murder of Crows vigor bottle replica, hand-painted and distressed, and features a sturdy brass ring.
*A 5 x 7-inch lithograph of a real-life piece of propaganda from BioShock Infinite by Jorge Lacera.
*A 25 millimeter, resin-cast Handyman miniature figure from the upcoming BioShock Infinite board game by Plaid Hat Games, makers of Summoner Wars.
*A 64-page collectible mini art book, full of BioShock Infinite concept art and commentary, with a hand-distressed linen cover.
Exclusive in-game gear
*Digital soundtrack featuring music from BioShock Infinite and is exclusive to the Premium and Ultimate Songbird editions.
*Platform specific downloadable content:
Exclusive avatar costumes of Booker and Elizabeth for Xbox 360
BioShock Infinite themes for PC and PlayStation 3
Premium cost $79.99 and Ultimate Songbird is $149.99
Once you pre order there should be a code that lets you unlock and play a puzzle game call Bioshock Infinite Industrial Revolution.
Pre ordering from a specific retailer will give you a exclusive game item
Gamestop: Comstock China Broom Shotgun
Bestbuy: Comstock Bird's Eye G10 Sniper Rifle