Forget Ebay or Computer Exchange for the Nintendo Wii... The place to go to if you want to buy a Nintendo Wii is Gamestation.
They are offering a Wii Combo comprising the console, Wii Sport, Big Brain Academy and three selected Wii Games for only £299.99.
Apart from the fact that they have Wii's in stock, the price is lower than what you would expect to pay on Ebay or in dodgier places.
Gamestation Wii comes with warranty and the extra games.