Any place that sales sevendust, and stuff like that. I know my local feed and seed sales it. I am pretty sure TSC sales it to. I have been using this stuff for years and It has never caused any harm to my dogs, cats, goats, chickens, rabbits, or anything else. Snake's just don't like it. I put along side my chain link fence and then I do the inside and outside of the coop around the bottom. The chickens do not mess with it. If you have ever dealt with sulfer you know why....... it stinks really bad, but it works.