I'm new to this forum. I'm looking for a used Coleman "Stirling Power Cooler" which the co. sold around 2004-08 but which was expensive, not very popular, and discontinued. This is not like the current thermoelectric models but used an entirely different method of cooling. Would anyone here by chance have bought one back then and be willing to sell? I demonstrate other machines using the same stirling engine principle to kids and adults at open houses in engineering at our university. Any help or leads would be greatly appreciated. Thank you.