I used to get wax at a place called J.F. McCaughin in California. I
don’t know if they are still there, as I bought so much, that I will
probably never run out! They were unusually helpful, and were
willing to custom make blends or special size blocks or sheets for
special projects. They also had a good supply of wax tools.
2628 N. River Ave. Rosemead, CA 1-818-573-5782
I just checked, and the phone number is no longer correct, so if
anyone is good in tracking people down, maybe you’ll have better
luck than I.