Here is another source.
http://www.brownells.com/gun-cleaning-chemicals/oils-lubricants/lubricant-protectant-oils/lubriplate-130-a-mil-spec-grease-prod6525.aspx
i picked up one of these from Northern Tool on Black Friday. I think it was $89. It has been doing a good job heating my workshop this winter.
When I lived up north in Illinois I purchased a similar unit for a 3 car garage. I had planned to use it for a short time until I could run a gas...
They are called heat trap ******. Had the same thing happen to my water heater. You can buy a new one or do what most people do take out the stop and have hot water.