hi Planejane,
I don't know if I can post a link here, never read the rules that thoroughly..but I got the black salve from Bevanpotterdotcom, located in Australia, and when you open the website, the list of products is on the left. The sixth one down from the top is "Salves and cremes", click that, and then the first one on the top left is the version I purchased, which is labeled "Centerforce Black Salve for Cats, Dogs & Horses" the 1.6 ounces. I believe the prices are in Australian dollars, I never checked my credit card to see what the American dollar total turned out to be.. It's not "cansema" by label, but it's the same mixture according to Mr. Potter. I bought the larger version as I wanted to have a supply on hand for future issues. Good luck!!