Gena beat me to it, but I would also recommend Sunset Valley. Fred did, after all invent the cross! He might have some in the back. http://www.pineridgeorchids.com/ might also have them.

Thanks Steve for recommending Pine Ridge Orchids as well.

Pine Ridge Orchids
 

I tried ordering from Pine Ridge earlier this year, but Mr. Glancy couldn't seem to get organized enough to either answer my emails or find the plants in question.