They do exist, maybe just not as extensive or easy to find as you would like, but i know Game, Zavvi, amazon etc... Do stock guides....Old, New and Future
Game.co.uk
http://www.game.co.uk/Accessories/Pl.../?s=collectors
Zavvi.co.uk
http://www.zavvi.com/books/gears-of-.../10532240.html
Amazon.co.uk
http://www.amazon.co.uk/Battlefield-...4066825&sr=8-1