so few individuals were collected from any of the locales that, actually, crossing them out is going to be the only way we will be able to sustain the population in captivity.
That said, if you're interested in rhac species, I highly recommend the book "Rhacodactylus: The Complete guide to their selection and blahblahblahlong_title", I think that Fast, Repashy, and de Vosjoli are all authors.
I know that Vosjoli has a variety of locales he produces and sells regularly, and if I'm not mistaken, Frank Fast is involved with leapin' leachies.
Before I actually decide to jump into leachies, I'm going to go spend some time over at the repashy.com forums, I think that's the only 'leachie heavy' forum.