I know these deals seem to be store specific, but here you go anyway.
I have just been in Currys in the White Rose Leeds where they have the following titles for £10
Rainbow Six Vegas 2
Top Spin 3
The Incredible Hulk
They also had Sonic Unleashed for £15
For £10 they had similar titles to the ones above and also had Motostorm.
They also had a selection of PSP, DS and Wii titles but nothing that really stood out.