I'm pretty sure you can order on line, it's just a matter of finding the right bit! You can also telephone him, he's really nice and friendly. The glass is not expensive, especially the mushrooms. I can't remember exactly how much they were, big ones are dearer, but I'm sure they were under £20.
I have a couple of wizard cone lamps he made for me, with the fittings. They were £92 each. I saw one in the Scottish Glass 2000 Exhibition, but it was sold even before I got there! I asked about it, was given his 'phone number, and the rest was history.
:oops: Have just checked, no you can't order directly on line, but he does
use first class snails. :lol: http://www.tipiglen.dircon.co.uk/intercone.html