Hi lureNflyguy,
You are certainly “ultra rural” and the closest forum list would be for the Pueblo/Salida/Colorado Springs area here and I don’t know if any of them carry two sided mattresses.
Two of the manufacturers that are members of the site carry two sided innerspring mattresses that they sell online and would be well worth talking to. They are …
https://www.mygreenmattress.com/
https://www.flexuscomfort.com/index.html
I don’t know their return/exchange policies off the top of my head so I would make sure you ask them.
Two sided innerspring mattresses are much less common online because they are much more costly to ship.
Another online source that may be worth considering is http://themattressexpert.com/mattress-brands/therapedic-two-sided-flippable-mattresses/ who carries some two sided mattresses that they sell online but I would make sure that you find out the foam density in each of their layers to make sure that they are suitable (see this article). You would also need to ask them about their return/exchange policy.
Shop Double Sided Mattresses (Flippable) | US-Mattress – US Mattress also carries some double sided mattresses but I would make especially sure that you know the quality/density of all the foam layers in their mattresses as well because some of them are likely to include lower quality materials than I would suggest.
There are also some high quality and very durable one sided mattresses that may also be worth considering if you want to broaden your choices.
There is also more about the pros and cons of one sided vs two sided mattresses in post #3 here and the posts it links to.
Phoenix