if you dont find enough this way, try looking into reclaimed wood. there are many companies that do things like disassemble old barns, houses, other buildings, fences, and such and then sell the "reclaimed" wood. My aunt has a "new" hardwood floor made from planks from a 200 year old barn that was torn down.
for example
http://reclaimedwoodmaterials.com/re...mber-and-beams