Just been into town, and had a quick look in Blockbuster, and was suprised to find it is on sale for £34.99 only.
Seems to be cheaper than pretty much all online sites too!
Hope this proves useful to someone!
Taken from play.com:
"Set in a battle-scarred future where war has become business carried out by mercenaries and machines, this visually stunning title sets new boundaries for gameplay and cinematic experiences in videogaming. The refined control system allows for some of the coolest gameplay ever seen as players guide Snake through to the end of his worn torn journey and tie up loose plot ends.
Additions to Metal Gear Solid 4 include rumble support for the new DualShock 3 controller, full 5.1 Dolby Digital surround sound support and more interactivity during the cutscenes such as allowing users to change angles and summon flashbacks.
The final part of this must have title comes in the form of Metal Gear Online, included with MGS4. Initially compromising of five unique online stages created using Guns of the Patriots technology, Metal Gear Online allows up to 16 people to play simultaneously in five different modes ranging from standard Deathmatch to Team Deathmatch, Capture and Sneaking missions. Further Expansion Packs will be released throughout the year ensuring the content is fresh and rewarding for the players."