No offense taken, here, either. Mum's the word for reasons listed - fear of other cuemakers, not the "public" or "customer base"
My best sources, as most cuemakers' probably are, is hanging around other high end woodworkers.
This is a true story from an annual party in October. Couple of us furniture & millwork guys are talking shop and a friend to one of the others in the group sidles up, listens a bit and asks " say, 40/50 years ago my GF was in the peace core in (someplace) and she brought back a log of pink ivory. Then someone else heard i had that, and they gave me another log." Holds hands at chest level for length, shows aprox (largish) diameters. "never got around to using it. What do i do with it now?" This leads to stories about one of the conversation participants arbitraging from a 28,000 lb dealer cache of pink ivory (container load) in the midwest, in 2,000 lb van loads at a time, between Ohio and NY, clearing mid/ high 4 figures per trip during the 1980's. Discussions ensue about the logs on the table, so to speak. I don't like pink ivory, but one of my other buddies got control of that narrative anyway. Then he & I collaborated on some things (including moving remainder planks from "the tree"), and he paid out with pieces from a skid of Brazilian Rosewood found in an old industrial warehouse a couple years ago, a small ebony log, and some snakewood. There are a few commercial hole-in-the-wall places to check occasionally. One is even a Mennonite sawmill. I certainly don't have your level of inventory, but i used to focus on higher quality (size) material since furniture and millwork were my (tiny) business.
Just remembered another story involving parties and pool. I used to avoid exotics in my millwork business, because the whole idea of "story woods" kind of rubs me the wrong way. Though i did like Ebony, Wenge, and bloodwood for accents and use in flooring; and African blackwood for making tool handles like the totes for planes i used to make. Wendell Castle gave me my very first piece of BRW. He had used a pile of it in some piece of furniture, and had planned to paint it white, to make a statement. I did not follow the whole story, it sounded like one of my other friends talked him out of it. I did not meet him until late in life, at another party. He liked my woodworking planes & was interested that i was starting to make cues. We had tentatively talked about him teaching me 3C on the table famously in the center of the reception area of his studio. But life got in the way, his health started to fail so he stopped playing, and it never happened.
smt