There are roughly 40 or so instructors for the course the last I heard - worldwide. That number could have increased some.
I teach in SW Pa but do travel to teach the class if I have enough students. You can find some other instructors/dealers that offer it by contacting HOG Edge as well. Going to the TDI Site does not always give you a good result since they don't list independent instructors. Just the facilities those instructors are affiliated with. Did you try DAYO Scuba or Diver's Supply?
I know DRIS teaches it at DEMA usually when in Florida, at their location, and at some of the other shows they do like Beneath the Sea and Our World Underwater. But these are not classes that are part of the show itself and may not be on the show website. Robert Arak teaches it on the West Coast.
I teach the classes in my home, or a hotel when traveling, to give the student as close to the same conditions they would likely be doing their regs in. If they come to me I don't charge any more for a private class than I do for a group one.
I will travel as stated but I need enough people in the class to cover my expenses or make some other arrangements.