I'm curious about this too. It is somewhat crazy how much the Chessex ones are selling for currently. I had no idea they were so pricey until I checked the other day. I own only the white one; I have no idea what happened to the black one. It would be nice to get a set of these again, but I am not so sure I want to spend a lot to get them.
If anyone knows more about the other pairs that the
OP asked about, I am curious to learn more, as well.