Yeah, to be honest, it's one of the easiest films to find.
Try looking in the "World Cinema" section of HMV. I had this problem before looking for a film... I knew the name, so I looked through the shelves alphabetically not being able to find it. I then asked a shop assistant, and they found it, in the World Cinema section. Give it a shot!
I really want to buy this film also, I love it. I'm going to try to make sure it's the Special Edition version, I prefer that more to the standard version.