I finally went to Oleksak lumber (in MA) today to get some rough lumber.
The guy was really easy to work with -- I called ahead of time, and talked to him about what I needed. He gave me air dried poplar for $1.00/board foot. He also through in basswood, white birch, some white oak, and some maple at that price!
About half of these boards were even planed!
Although some of the boards looked a little rough from sitting out, it was a great deal, and a good purchase. I definetely recommend this place.