I was at Target this morning and saw a large metal hose container that would make a good cauldron. It's a little more than 2' across, about 18" deep, and is sort of a mottled gray color. It also has a 2" hole near the rounded bottom for a hose to go through, but it's perfect for attaching a fog pipe. They're going for $14.99 in the outdoor/garden section. I can't find it on the web site, but I'll try to get a pic. If I didn't already have a cauldron for my witch project, I'd definitely be getting one of these.