Hi loweye,
The first place I would start your research is the mattress shopping tutorial here which has all the basic information, steps, and guidelines you will need to make the best possible choices and will also help you identify which retailers to work with … and perhaps more importantly … which ones to avoid.
There isn’t a forum list for the Farmington, NM area so I took a quick look around the area (including Farmington and Durango, CO) and the only “possibility” I could see based on the information on their website (I haven’t talked with any of them) and the mattresses they carry that I would consider on a "mattress by mattress basis (and only if they can provide the specifics listed here about what is inside the mattress) is …
http://www.sleepnairemattress.com/ Farmington, Albuquerque, NM. Sherwood, Southerland . I did talk to them some time ago and I believe they carry mostly Southerland in the Farmington location.
Other than that … the closest of the better options or possibilities I’m aware of would be in the Albuquerque/Santa Fe list in post #5 here. The tutorial post also includes links to the better online options I’m aware of as well since there aren’t a lot of good choices available that are close to you.
Phoenix