There are three plants up for auction on eBay. Two plants are from Kawamoto Orchids, purveyor of many orchids. This company is in Hawaii and is very reputable. I have bought a plant from them and they are very easy to work with. The other plant available is from a guy named "shermantp" out of Larsen, Wisconsin. I have also bought a plant from him. He is also very easy to deal with. If you go to eBay and search for "peristeria" you'll find these three plants.
These plants seem to be large plants and the shipping costs are high. Here is a picture of the plant from shermantp. Just for kicks, I might go ahead and bid on it. Right now it is up to US$39.75.
Carter and Holmes has a pretty good description of this plant's culture. Here is a link:
http://www.carterandholmes.com/peristcare.html
PS: After reading this thread and then elsewhere on the web, I went ahead and bought this plant from Kawamoto Orchids out of Hawaii. This orchid vendor is really easy to deal with--I should have this plant and another Vanda in Fort Wayne, Indiana this Wednesday. Thank you for introducing me to this plant.