I acquired a couple of small plants from Rogozinski when I visted his nursery in 2008. He doesn't do mail order though and has no internet presence, so you have to be there.
I have another small plant which I had from Mark (Tam here on the forum), but I don;t think he has any left now. It was a ML collection, so I would expect the seed came from Rowlands, now closed sadly.
One of my plants flowered last year, but it doesn't appear to have set seed, at least not yet. If it does, I'll let you know!