I was looking around on the east tx CL and there are lots of postings for free wood-----usually none once it gets cooler/cold. I drive a lot in this area and see a lot of tree removal, so if you are in serious need of some wood, it might be worth the drive. lots of oak.
http://easttexas.craigslist.org/zip/
http://easttexas.craigslist.org/zip/