Hi Robbie,
I took a closer look around the area and you’re right that most of the stores there only sell major brand mattresses. Out of about 20 stores or so I looked at or called to find out what they carried within about 50 miles of you … there is only one that I would consider as a “possibility” (subject to the “value” guidelines here). They are …
http://www.superpages.com/bp/Columbus-MS/GooseHollow-Furniture-L2062413884.htm Columbus, MS. They don’t have a website but they carry Jamison mattresses (including latex and memory foam) which tend to use higher quality materials in their mattresses and may be worth including in your research.
Other than this I would look at the other options in the lists I linked which involve a longer drive or I would look at the online options that are available to you.
Phoenix