Hey thanks for the quick reply!
I had a good look at BRE Software before posting, they only sell NTSC games, but luckily quite a lot of current generation games are region free, so they aren't completely out. Though, their wholesale prices aren't all that great.
Comp Gallery looks OK, some of their prices aren't too shabby. The main problem is they don't have all that many games, they don't seem to deal in used games and they also sell mostly NTSC.