Not sure about coal, but yeah I'm out here on the Dakota prairie. You pretty much have have to know somebody that has trees on their property
I am straight East of you in Minnesota on US 12. my ash is all cut into rounds and there’s like 6 cord sitting there to be split. Have you checked with the Mennonite if they have any wood available for sale?
If I see myself getting close to running out, I start loading half the seasoned stuff and topping off with the dryest I've got. Save your propane for shoulder season. Then again, I've only got wood for heat, so it's run whatcha brung for me.