Hello,
I'd say it is partially true that "high end" Chondros do not make to public classifieds. Only partially true, though. There are a number of stellar animals and pairings most of the time on another, Chondro specific, site.
Here's how I would recommend obtaining a not often offered animal (and this has worked very well for me):
1) Pursue the breeder of the animal(s) you like. 2) Have cash in hand. 3) Don't flake.
That's it, really. There are nuances to the three points that could go on for pages but it really boils down to the three (for me).
Say, for example, right now you have a few CB(!) Chondros and have had them for a while (year ), are pretty well-read on Chondros and are looking for a line/selectively bred animal that does or may have the phenotype you are interested in, but you do not know any breeders specifically. You can put a general call-out on a Chondro specfic website of course, but what I'd recommend is to contact someone like Rico Walder and tell him what you are looking for and about how much you are willing to spend. You'd be amazed at the results. Maybe even send a pic of the exact animal you fancy and more likely than not he can tell you who owns or bred the animal or if you being realistic. A LOT of Chondro people know each other pretty well and also what people are working with which lines. Expect to get an answer in a day up to a month. (Once, I wanted a yellow faced animal and put the word out and I think it was about two years till I attained him {Moken}. A blue one (LBB) took me six months. Sometimes it has only been hours {LTFM}).
That's the easy part. If you don't flake and come through with whatever you agreed to, then you will build a reputation and probably be offered animals in the future before: 1) they are hatched, 2) offered in the classifieds, 3) anyone else is offered the animal you've always wanted that just became available. The flaking part is where a lot of folks stumble. Disappearing and wasting somebody's time is VERY difficult to recover from--again, a lot of Chondro people know each other.
Anyway, just a few thoughts. Hope this helps some.
--John