Just a few directions
1. Peebles, oh area up rt 50 has several sawmills that might help you out.
2. In KY they saw white oak for barrels at several sawmills. Red oak just sits and this is where my frame subcontractor sourced the wood for my place 7 years ago. I'm thinking it was .70-.80/bf for gorgeous boxed heart beams as long as he wanted...
3. A ton of smaller Amish sawmill operators who work cheap and usually quite good can be found in your area and more headed east on rt 50. Biggest pain is loading at their yard. Treat them well and they will take good care of you.
4. There are some salvage guys that sell timbers from historic structures. Closest one I know is in Lancaster, oh. I might still have his info, just not offhand.