When I was in Asda, I found Ghost Squad for th Wii for £10
The Ghost Squad is a Special Forces unit established in strict secrecy by the U.N. to combat terrorism and carry out special highly-classified missions without leaving a trace. As an elite member of the Ghost Squad, players will complete dangerous missions such as eliminating terrorist groups, releasing hostages, deactivating bombs, and even rescuing the US President when terrorists hijack Air Force One! Using the Wii Remote, players will utilize revolutionary selectable weapons including a high powered rifle, sub machine and shot gun, or even engage in hand-to-hand combat.
The game has received generaly okay reviews with an average of 69 on Metacritic.com, including a rating of 83 from Official Nintendo Magazine, saying:
"Better than being in the arcades and with more extras than an all-you-can-eat buffet, Ghost Squad gets a high five from us. Future shooters take note: the bar has been set high."
According to find-games.co.uk, the next cheapest from reliable retailers is £12.72, so although it's not a huge saving, every little helps.