I would like to have all 4 species. Does anyone know of a source for these
interesting plants?

Not sure what he has at the moment, but Bill Tippit of Olympia Orchids usually
has a very impressive array of these.

I believe most are collected species, but the roots are very good (I have
visited the greenhouses and seen them), and he has also done some crosses with
them.

olympiaorchids.com if I recall correctly.

Tom.