Browsing in Zavvi/Virgin Megastores and saw there were lots of cheap dvds!!!
Click for £4
Inside Man £3
Black Christmas (i think was £5)
and more, im trying to think what else but cant remember, there are lots of really cheap dvds though starting from £3!
Offline only though as i notice the online price are more expensive! so pop into your local Zavvi!
Also if you are a student and have a virgin student card you get an extra 10% off!! (you can get these student cards from filling in a short application form and showing you valid NUS id. however my local one run out of forms :( )