I made one out of some spare 1/2" aluminum square stock from the garage. It took me 5 minutes. Put the wire in at the top, tighten the set screw, and wrap. I've got extra holes for different diameter coils.
The only time I really use it is when I'm wrapping micro coils with 26 gauge wire, as it's really stiff and hard to hold while you wrap around such a small bit.
Make 200 of them and bag them with a set of common diameter sized pins, and I'll bet you can put enough cash in your pocket for 2 or 3 Provaris!

Apparently Necessary Disclaimer: The item(s), and/or vendor(s) mentioned above, were purchased/patronized for my personal use, and in no way sold by or affiliated with my business interests...