Another good site is this one:
Fanplusfriend Garden, Gothic Lolita, Man's Goth,Cosplay
I've never bought anything but they have a massive range of stuff.
I've got
loads of goth/visual/punk clothes I want to sell! We should have a selling/trading thing on JF because I have quite a lot of stuff you guys might like but I don't fancy wearing anymore, and it would be sold for a lot cheaper than what you'd buy in the store too. So yeah... ^_^;;