The Forbidden Planet store in Manchester (on Oldham St) have a clearance on of 50% off ALL video games and peripherals. The range isn't huge, but it does include PS3, XBOX 360, Wii, DS, PSP, XBOX, and Gamecube - new and preowned all included in the clearance.
Admittedly, most of the newer release games are marked up at full RRP, but with the 50% discount they fall into the 'good value' price range.
I picked up the follwoing:
Metal Gear Solid 4 PS3 £12.50
Call of Duty 5 PS3 £20.00
PES 2009 PS3 £12.50
Disgaea 3 PS3 £17.50
Mario Slam Basketball DS £7.50
Monster Jam Wii £7.50
and a few others
Not very well advertised so they still have a few good games left. I was also told that stock from other stores will be brought in over the next few months to be sold off.
I think once they got rid of their stock they won't be selling any more games as a business.