Try the pharmacy, the medicinal stuff is pure. I think it's labeled"flowers of sulfur". I got some awhile back for another purpose.
Ron Charlotte -- Gainesville, FL@Ron_Charlotte1 OR email@example.com
Jeff, another possible source would be sublimed sulfur (I believeit's 100% sulfur) from a pharmacists shop. I bought line from alocal drugstore. Small quantities and I have no idea how the pricescompare but it is another source.