Paper company may be the best bet, but contact all the consultant foresters in your area. They manage large estates and may have a tract or two. Some banks have trust departments that have access to tracts of land. Run an ad in the papers. Some of the consultants (they usually work on a percentage) may give you special consideration if you offer more $$$ per acre. A lot of information, names and addresses, can be gathered from your local county forester or your agriculture office.