Check out your local Wal-marts for ice fishing heaters, I got a dyna-glo [it looks like a little buddy] for $35.00 the other day, thats more than 1/2 off the reg price of $79.00. I bought one a couple years ago and I love it, now I have a spare.......
If I had the money I would buy a slew of them and next season when everybody is looking at them to ,I'd sell them one for a small profit and save them money as well.