Another FREE source for excellent wood is those driveway and parking lot 42"x1"x!" stakes, sometimes painted orange at one end, that tell the snow plow driver where the paved asphalt is, under the snow.
On April 1 just ask the building management if you can have all their old winter stakes if you walk around and remove them ..... no joke.
Cut from el cheapo NH hardwood, they burn totally excellent, the greatest kindling ever in the world history of hearth heat fire. ....