Just about any hardware store should have them, or you can almost certainly find them on Amazon or elsewhere online. They are well worth the price. I got a small one once to fix the drain pipe of a washing maching that wouldn't drain, and it fixed the problem in seconds with no trouble at all, and no damage to the machine. Cost to me: about $12 or $13. After I used this tool the washing machine was as good as new. Another one I own made quick work of solving a bathroom sink drain that had defied solution with a liquid drain cleaner. And it only took seconds to clear whatever the obstruction was. Never again had any problem with that drain.