Aware this might not be available to everyone but the Sainsburys store in Uxbridge had an up to 50% off gaming display at the front of the store. Best deals included:
2000 Wii Points £4.99
Disney Infinity Starter Pack (PS3/Wii) £17.99
Various DS/PS3/Wii Games at £5 - will post picture below.
I picked up the Wii Points but everything else was still there. Also checked the Slough store which had Skylanders Starter Kits (PS3/360) for £14.99