Hi Jesper,
what's wrong with pyrrhogaster and orientalis?
At least C. ensicauda is also bred regularly. Luckily most of this offspring is not sold commercially but given or traded among enthusiasts. On the other hand most of wc animals sold via petshops will never be bred.
Your best bet would probably be to join a Herpetological society and/or keep in touch with people on this board. I can tell from my own experience that it almost always takes quite some time to get hold of cb offspring of a certain species.
On the other hand, I do not favour to think of offspring as "ware" nor is it desirable for enthusiasts to "commercialize" their hobby, meaning to breed quantitudes of animals just for a potential market. True, there are some around. Still too many in my opinion.
There is some basic info on Paul Bachhausen's "salamanderseiten" concerning C. wolterstorffi as well as on the newt registry for Cynops within the AG Urodela. However, I am not aware of any German website stating that C. wolterstorffi is being kept in captivity. Since I am very interested in this genus I would beg you to provide the link. To my knowledge this species from Kunming lake is extinct and hasn't shown up again despite a "bounty" that has been put up for delivering some.
If you are also interested in Cynops and already keep orientalis and pyrrhogaster, why not join the Cynops Newt Registry? Anybody keeping one or more Cynops species is welcome to join.
Ralf