I can help you with a few. I purchased Cycnoches peruvianum (seedlings) from Lousiana Orchid Connection. They aren't listed on the website. I bought some when they were listed on Ebay, but you could inquire about availability via email. The email is
john@laorchid.com.
Ben at Orchideros has Cycnoches cooperi available for $30. Here is the website:
orchid-eros | Miscellaneous Orchids
Ron at New Earth Orchids has Cycnoches barthiorum 'Pink Dove'. I contacted him via email to inquire about prices/availability and order a plant, his email address is
ronnewearth@icloud.com.