Did you ever find one Dave? I did see a bunch of various sizes on ebay last year. I think they were shipping out of China. The larger sizes were more economical than the smaller ones, and it might have enough to make a few others depending on the size you need
Here's one I found doing a quick search
https://www.ebay.com/itm/26685631417...=&toolid=10050
and some smaller ones
https://picclick.com/Various-sizes-6...733102740.html