I bought my mule ear (Trt) from Ruben at " Ruben in Orchids" in Homestead Florida. He doesn't have a great web site but his phone number is there. Give him a call and see what he has. He travels to Central and South American to collect species. He also has a masters degree in orchid taxonomy. If he doesn't have what you want he may be able to tell you who does.
Oh. Rat's tails and Mule-ears ORCHIDS! I thought your were asking for Rat's tail plant Crassula lycopodioides, and Mule ear Kalanchoe gastonis bonnieri.
Can't help with the orchid, but if you ever want some of the others...