Kuhn Rikon makes double walled pots. Available at:
Kuhn Rikon Swiss Thermal Cookware - FactoryDirect2you.com
They also have a cool single wall pot that has a melamine shell you put the pot into:
Kuhn Rikon Switzerland - Hotpan Cookware
I looked for a long time to find these double walled pots for cooking on our wood stove. For folks that have never heard of this type of pot... They are NOT for camping. They are used to slow cook food with a very small amount of energy in a cool environment. The heat goes into the pot on the bottom, and the food at the top of the pot is cooked evenly with the food on the bottom. You don't have to lift the lid and stir, losing heat and moisture.
Hope this helps