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https://www.amazon.com/Mr-Heater-F232025-Portable-California/dp/B002QUZGS8/ref=sr_1_3/132-5928802-9197947?ie=UTF8&qid=1511615825&sr=8-3&keywords=buddy+heater
I use a buddy heater and made a cook rack. I have a small cake pan that fits it for sausage and eggs. It lays flat for storage.
I know its a little more than you want to spend but right now Menards and Tractor Supply have the Big Buddy heater on sale for $99. Its propane, It heats good size ice houses well (depends on size and insulation as with all heaters), and with a modification you can make your coffee. Google Big Buddy cooking or modifications and you will see quite a few ideas. The sunflower type suck IMHO. Gives me a head ach every time now. Back when I was young that is all we had but by the end of 4+ hours most of us had head aches. Not with the Big Buddy.