You might want to send either Oak Hill or EFG. They don't list much, but they've brought 3-4 different species to shows before. If you can get in touch with Erich Michel, he might have some really cool hard to find species. He was in charge of flasking for Hoosier Orchids before they closed, and he ended up with most if not all of the seedlings in flask. He usually brings some really cool terrestrials to shows.