Here's the limited edition of Alan Wake at ShopTo. While it's only a measly 15p cheaper than the play.com version, you do get free 1st class postage and guaranteed arrival for launch day instead of play.com's second class postage.
Alan Wake game
Exclusive in-game audio commentary and hints by Remedy
"The Alan Wake Files" - 144 page book that includes a short story written by Alan Wake and compiles the FBI dossiers investigating the events in Bright Falls, WA
Exclusive Audio Disc with soundtrack and score
Game Add-On Token redeemable on Xbox LIVE for the first Alan Wake add-on content pack
Exclusive Xbox Disc with special content: Alan Wake Xbox LIVE Theme and Alan Wake Avatar for Xbox LIVE