I've met that vendor. He's a real jerk
You can see some of my work in this thread here
. I'm currently running a special on in-stock handles.
Spitfire also makes
some gorgeous tap handles from cast acrylic resin.
If you want to make them yourself, the easiest thing to do is get a 3/8"-16 threaded insert. You can get them at any hardware store, big box, McMaster, or pay a lot extra to get it from Morebeer.com.