Renantheras are in the Vanda family and conditions are similar. You might ask Cynthia about this, but I usually see Renantheras pot grown whereas I often see Vandas in baskets.
Some of the Australian terestrial natives are available through ...um, what is that nursery in Oklahoma....Stephen Monkhouse is the proprieter...
Adelaide Orchids. Stephen had a nursery in Australia and one inthe US. He moved his Australian nursery to Indonesia and I'm not sure what happened to his US nursery...if it is still up and running or not.
Check it out. I bought some Pterostylus from him a few years ago and he sold some Thelymitra (note spelling) at that time too.