It took me almost two years to find the singleton I picked up last year. I have no information for you. Perhaps you will have to grow this one from seed? Not much help for you.

I wanted to let you know that people had read your post, just that I don't have any answers for you. I got mine at my local Cactus & Succulent Society meeting. Perhaps you can check into C&SS's near you, or contact the International Society...

Good Luck with this.

Thank you.
:)

You might try Tropiflora for them. Just email them. I do not know if they have that many but ask anyway.