Even though our vacation came at the start of summer, we saw lots of firewood for sale in the UP. Every other rural house or small-town gas station seemed to be selling camp wood for sale, always on the honor system. $4 a bundle was the normal rate, but I did see some priced to move at $3. This appears to an unexploited marketplace inefficiency. Someone should buy all the cheap wood, then sell it to desperate tourists at campgrounds for $6.
Here and there, I also saw bigger quantities for sale – by the cord, by the pile, or even by the truckload, albeit through a raffle.