I just saw a thread posted that you can get Apocalypto for £3.99 second hand on Game...
and looking through there were some good other deals that I thought deserved a thread:
(next cheapest is off of Find-DVD)
Face/Off £4.99 next cheapest £9.99
Flight of the Phoenix £4.98 next cheapest £8.95
Little Miss Sunshine £4.98 next cheapest £9.85
The Devil Wears Prada £4.98 next cheapest £9.49
Fantastic Four £2.99 next cheapest £7.99
Harry Potter 5 £3.99 next cheapest £8.95 (though is pretty cheap in the 1-6 boxset)
The Hills Have Eyes 2 £4.99 next cheapest £8.39
Tallageda Nights £4.99 next cheapest £8.44
Ghost Town £4.99 next cheapest £8.45
Quarantine £4.99 next cheapest £7.95
then a few less impressive discounts that probably aren't a justifiable reason to purchase second hand on here for most people!