I was in WHSmith in Swindon and I picked up a range of PS3 and WIi games at half price.
E.g. Street Fighter IV was £19, half price = £9.50 (Both Xbox and PS3)
Motorstorm was £9, half price= £4.50
Motorstorm Pacific Ridge was £21, half price= £10.50
Zak & Wiki (Wii) was £9, half price= £4.50
LEGO Batman (Wii) was £20, half price = £10 (Also on PS2)
Not sure if this is Nationwide. So make sure you get in quickly.