Some of these have already been posted. There are two bins full of 50% off clearance games at the front of the store. Stock is quite limited and the price is store specific. Other games include:
Motorstorm: Pacific Rift - £9.99
Tekken 6 (PS3+Xbox) - £17.50
Banjo Kazooie: Nuts & Bolts - £3.98
Sorry, thats all i can remember off hand! Some alright games kicking around there though!