I'm in a very small village out in the country. We have cheap electric so a lot of house have converted over to electric boilers tied into their old oil burners. I added an electric plenum heater to my furnace and just that cut my heating bills more then half.
But with all the wood lands around here, wood is plentiful and is the cheapest fuel source, closely followed by electric, and then that, closely followed by coal. Oil and propane are waaaayyy more expensive.
However, knowing someone who can supply free wood, or very low cost wood, and telling others about it is dangerous, . . . you might get run over in the stampede !