Hi Michael,
Post #6 and #7 here includes some good options in the Asheville area and also has links to larger lists centered on Greenville, Hickory, Knoxville, and Seneca/Clemson.
Original mattress factory is a larger regional factory direct manufacturer that make high quality mattresses with good value including a memory foam model, two latex models, and many traditional innersprings. They are quite open and transparent about the materials they use and are usually among the better value outlets in many areas. In your case however you have an unusual amount of factory directs fairly close to you and have a much wider range of high value choices than most areas of the country. A few phone calls though should help you decide which would be worth a visit.
Phoenix