I was lucky and found a tin at Wally World the perfect size for me. It has a mirror copper-like finish inside and out and came as a container for cookie cutters.

It would be nice to see something like man-made pre-fab, lightweight, portable paunch stones that would heat up quickly on their own. They would be already clean and heat up that big pot of "whatever I eat" quicker. Inexpensive and they have to be reusable.