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Do you mean new or used?, anyway you can some new ones from these places, http://www.play.com – they have some at £89.99 , http://www.amazon.co.uk or to get the Guitar Hero pack, try here: http://shop.gameplay.co.uk/webstore/prod…
As for used ones, try local game, gamestation and independant game shops or CEX – http://www.cex.co.uk/products/gaming/por… – although they are a rip-off.
You can buy a used one at many “Gamestop” locations.
Depends on where u live, i live in england and i bought it for 110 pounds new+ any game.