Oh, I searched Google. And what I found were almost entirely
free-form cabs like these, not the 8mm rounds that I need.
Wholesalers can be kind of an issue for me as I order stones in small
lots, not large ones because, being one of the jewelry artist types &
a grad student to boot, I generally don't need large quantities of
stones. Alas. I'm hoping the Allan Goldman link will pan out, once I
can get on it & a couple of others.
Artist, Metalsmith, Chaos Magnet