We just got the cheapest single burner propane forge eBay/Amazon. Working great so far. Looks like this https://www.ebay.com/itm/176573538859 https://www.ebay.

We just got the cheapest single burner propane forge eBay/Amazon. Working great so far. Looks like this https://www.ebay.com/itm/176573538859 https://www.ebay.com/itm/176573538859 Note that a forge produces big noisy flame and burns a lot of gas. If all you want to do is heat a nail a plumbing torch will suffice. But if you want to make a knife you will need some sort of forge.