As nobody else has bothered, here is the link to the Blockbuster exclusive Penguin SteelBook:
X360 -
http://www.blockbuster.co.uk/product...ive/269735.htm
From what I can make out, they only have the X360 version as a SteelBook. Not sure whether this will change at a later date, or whether the other versions have since sold out, but the X360 version is the only one I could find listed on their website