You might want to give Robin Jackson at Jackson International Corp. a call at 919-539-5510. He is a very nice guy to work with and his prices to individuals are near wholesale.
He is not always at his warehouse but will meet you there if you call ahead. I was at his warehouse yesterday for the first time. I did not discuss flooring with him, but observed that there were pallets of flooring around and he mentioned that he has it.
For an example, his 3/4" birch plywood (13 plies including face veneers) made by US Plywood was $41 a sheet.
I found his name here and a search of posts indicates that others have had good experiences with him.
The warehouse I visited is in Fuquay-Varina very near the intersection of 42 and 401, but he said he has 3 places where he warehouses inventory. We went to 2 warehouses there so he may have a third right there or it may be elsewhere.