Tools-Basics-Cauldron! - Suggestions?

One of the tools that I definitely want is a cauldron. While I know that there are substitutes that I can use I can't seem to find anything. It will have to be strong enough to hold burnings like paper and such. I could use one of my pots that is made strong enough for this - that's an idea - but I would want to use it for this purpose only.

I do want a cauldron though and will probably go to some flea markets to find one.