I found a cool Australian website, the company is called Pulsemate: Metal detector coils and accessories. They make aftermarket coils for Minelab PI units, Whites GMT, Teknetics T2, Fisher Gold Bug, Garrett Gold Stinger, Garrett Infinium, C-Scope CS-6 and CS-4, and Tesoro Lobo & Gold Demon detectors.
Several things got my attention, first my search was for aftermarket Infinium coils, and of course found it! I haven't called them, but it looks like they are going to in in production mode later this year. Second thing that caught my attention was they make coils for three of my detectors, the GMT, the Tesoro Lobo Super Traq, and the Tesoro "Gold Demon" Diablo II. I had pretty much given up ever seeing aftermarket coils for the GMT, Whites I figured had moved their focus to the TDI Pro and the SL so I didn't think they would ever do anything in that arena for the GMT. As for the Tesoro's, I was always surprised that nobody had made more coils for the LST. I figured since there's nine factory coils for it, they probably though there was not much intrest. When they said "Gold Demon", I'm assuming they are talking the Diablo II and the other versions. It would be really cool to get some other coils for my Diablo II because as Reg put it, "they are as scarce as hens teeth". We just need to keep an eye on the website, and maybe some of the Aussie members can call and see what the deal is, since it's more local for them.