You can find red and white oak in PA and Ohio. Hochstettler milling down near loudonville cuts and I think planes some pretty large stuff for timber framers. I did a white oak porch for my parents awhile back - I bought it from a local down that way. Don't remember the mill, smaller operation than Hochstettler but was ok quality wise.

Join the TFG, and start reading back issues of the journal, the Sobon books are good, as well as workshops at heartwood and elsewhere.