I heat my house 100% with wood. We cut all year, for the most part, but if you get a live tree down in the spring it might be ok that winter. 30 days seems a bit short to me. I usually go for the standing dead though. Cut, split, and burn. If you're going into the NF, you should be able to find plenty of standing dead. I plan on doing this myself since I've cut all of the dead stuff on my property. $20 a cord is a steal, as long as you can get to some good wood that's not a PITA to get to.