This service will make your glaze recipe and send it to you in dry or liquid form. They appear to have an extensive selection of materials, and the prices looks fair. Haven’t tried them yet, but it looks like a good resource. You can also buy glazes that other “community” members have posted on the site.
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Barley Hollow Pottery 
Hello! I am searching for copper wash, ferric chloride solution, terra sigillata and copper carbonate. Do you provide these? Thanks, Carol
Hi Carol,
I think you want to email the folks at GlazeMixer.com. I don’t resell any materials.
You might also contact Fat Cat Pottery in Wilmington, NC. They have raw materials, too.