Hi BryanR,
The closest factory direct manufacturers to you are in the Pittsburgh area and are listed in post #2 here.
Since these are a fair drive away … I spent much of the morning looking at options or at least better possibilities that are closer to you. This includes everything within about 50 miles of you that I could see. Some of these I’ve talked with and some I’ve just listed the brands they carry that may include some models that have better quality/value but would need further research into the materials in the specific mattress you are considering (and this would depend on how knowledgeable the retailer is about what is in their mattresses).
http://delanosfurniture.com/ Terra Alta, Reedsville, WV. Talked with the owner and they carry Imperial and Perceptive Sleep (HSM) and Dutch Craft mattresses. They told me that their manufacturers may not provide them with all their foam densities but the owner is knowledgeable and has toured the factory to confirm foam quality and is passionate about smaller brands. He also has a lower profit margin to provide good value. More knowledgeable than most about mattresses materials and the industry in general.
http://www.heraldstandard.com/marketplace/industry_manufacturing/furniture/angelic-bedding-furniture/business_1102612647.html Uniontown, PA. Symbol, Dutch Craft, Bernards. Knowledgeable about mattress materials and foam density and open about what is in their mattresses. No latex but carries gel foam and traditional mattresses. There are some good quality/value possibilities here.
http://grandmashousewv.net/ Nutter Fort, WV. Springwall, Restonic. Has some layering information available but not complete. Changing their Restonic line to gel.
http://www.ralphsfurnitureinc.com/ Buckhannon, WV. Carries Imperial and Sleep Logic which may be worth considering here.
Chuck's Furniture and Mattress in Morgantown, WV | Since 1967 Morgantown, WV. they carry Pure Talalay Bliss latex mattresses which may be worth considering.
I would start with a few phone calls to talk with the ones that are closest to you too ask about the types of mattresses they carry that you may be interested in testing (based on the materials you are most attracted to) and to get a sense of the level of knowledge and experience you can expect when you go there.
Hope this helps
Phoenix