God Of War 2, PS2 - £11.93 delivered
Chronos Twin, DS - £5 delivered
Pretty much everyone should get this game at this price, it's a fairly old school, indie, 2D platformer, not unlike the Megaman games, but with a really unique twist. You control two guys, in different time zones, at the same time.
This video explains it pretty well (although it is squashed to show both screens)
Sega Superstar Tennis, Wii - £25 delivered
Stuntman Ignition, Xbox 360 - £9 delivered
Prism: Light the Way, DS - £7.99 delivered