Quill — Mine's the same as Julie's but shorter, about 30cm (~12"). The advantage with mine is that it will stand on one end without support — disadvantage is that there's not so much light for larger objects. I bought mine off the Internet, having tried our local photographic and lighting dealers without success. Also I have a portable 6" battery powered version which works well for smaller objects.
Quicktest does the battery version together with smaller testers, and has an information page with a link into their catalogue
here. Quicktest will ship worldwide.
Photographic and lighting dealers are a struggle in my experience. Here's the conversation (different subject, but don't expect any better) at our local Jessops about three years ago (yes, it's true):-
B.C. — "Do you sell light tents?"
Jessops — "No, Sir, try Millets." :spls:
Good luck,
Bernard C.

ps — in my experience lighting dealers will try to sell you a fluorescent tube fitting with a standard tube and then charge you extra for the blacklight tube.