I don't remember where it is, since I was there three years ago, but there's a store called Forbidden Planet in Glasgow that sells scifi merchandise, and pretty much only scifi merchanidise (also comics, anime, etc). I think it's near a TGI Fridays, if that helps, but you would be better served to look it up in a phonebook. Anyway, I recommend you go in if only to weep at the stuff you can't afford to buy :)