I was in my local (Metro Centre, Gateshead) HMV store today and picked up Troy for £3. There's actually quite a few decent and fairly modern DVD's for £3 but Troy is the only one i picked up because I've already got the other ones. Sorry I can't remember what other ones there were.
It's £3.00 instore and £2.99 delivered online plus Quidco.
Remember if you're a student i think you can get discount.