The regulations are much tighter here on firewood cutting in the national forests. Pretty much not worth the effort to do legally.
My nearest NF district..."Permits cost $20 for two cords of wood, up to a limit of six cords per person, per household, per year" That's cutting already down wood within 50ft of the roads. Not hard.
http://www.fs.usda.gov/main/mbs/passes-permits/forestproducts
Well worth the effort.
My first choice is trees from my or my neighbors' properties, then word of mouth through whoever wants wood removed. I scored good wood last year from a friend of my parents' neighbor. Now my uncle wants a bunch of trees taken off his newly purchased property. But I still get a bunch from government permits.