How big?
We sell scrap wear liners as firepits to campgrounds, they absolutely love them. If you want one I can certainly hook you up, but they're about 600lbs and bigger.
The reason campgrounds love them is they're durable, they don't melt or break, and once you get a fire going in them they absolutely radiate the heat. We were selling them to a guy who would weld feet on the bottom, and put a spit across the top.
They look like this:
