From PS3 Attitude: "Fancy getting your hands on an e-book that offers to reveal important background details on the mysterious sky-city of Columbia without spending a cent? If you’re in the USA, you’re in luck.
BioShock Infinite: Mind in Revolt is the aforementioned e-book, available normally for $2.99 at Amazon.com. Want to get it without charge? No problem. You can grab the Kindle edition (you don’t need a Kindle, of course; you can use iOS, Android and web devices to read it) free with Amazon.com pre-orders of BioShock Infinite."