Barney Greer's The Astonishing Stanhopeas available @:

Orchidaceous Books
P.O. Box 378
Alstonville, NSW 2477
Australia
Tel: +61-2-6628 1438
Fax: +61-2-6628 1999
[they take Mastercard and Visa]

~$25 AU + ~$11 AU shipping. Will likely be available stateside before too long. Why wait though?

My opinion - Great bang for the buck. It's not a scientific monograph nor of great culture value. And the construction is pretty shoddy. But darn it, the photos are great. Good enough to help tax out your un-id'd or mis-id'd plants. The best revelation about this book? It will expose more people to these plants which will drive interest in obtaining plants which will cause growers to offer more plants which will drive the prices down which will make me very very happy :)