Keep in mind that hardwood lumber is sold by the board foot, not linear foot. 12" x 12" x 1" = one board foot. Sometimes people intermix the two terms so be aware as it can be a considerable difference in cost.
I agree with Tom, around here I contract with a local woodmizer owner to have lumber custom sawn but then again I live in an area that has abundant timber resources. As a point of reference, 2 years ago I had a guy come to my property to cut some white ash logs for me at a cost of 25 cents per board foot with me suppling the logs. As a very rough SWAG, and depending on lumber grade and kiln treatment, a FAS or #1 grade kiln dried white oak board should retail for around 3-5 dollars per board foot.
Try this sawmill, I am not certain that they do small sales but who knows: http://www.gilkeylumber.com/.
This company is a bit closer to you: http://tshardwoods.com/
Also, during WW2, Chevrolet had a specification list of suitable lumber species for use in their trucks and nearly every major tree species was on that list. Evidently they were not too picky with wood quality, but then again they were considering the effective life of the vehicle in months not years. Baldwin Piano Company was one of the companies that made wood beds for vehicles during the steel shortage years of late 1942-early 1944.