They run about 5 bucks for a bag.
Couple of things about wood heat for me.
Yes. It’s a dry heat and does an extremely good job at drying clothes, boots, etc. add the fact that there is ZERO condensation on interior, for these reasons alone, Wood heat is enough for me.
It’s safe, virtually no CO2 concerns. (If you die from inhaling wood smoke, you probably shouldn’t be in the woods anyway)
Reliability. I have had multiple propane heaters stop working, work incorrectly (elevation concerns) or just flat run out of propane. Every where I hunt, I can, worst case, cut and find firewood. Never failed me once.