I know this is store specific sorry, but thought it might help someone so posting anyway. Alworths in Wokingham have loads of xbox, Wii, PS3, and DS games for £5 each. Don't remember very many but they had the following;
Wii - Carnival games, Barbie Horse Riding, Big Beach Sports, My Word Coach and
DS - Tamagotchi corner shop 2, Pictoimage, Brain Challenge, Boogie, Animal
Rescue and others I can't remember now!
I didn't see what they had for PS3, but for xbox they had loads of games at £5 including viva pinata.
Also they had LIPS on xbox with 2 microphones for only £15.