Hi msmandy,
There aren’t a lot of good options that I would consider but the better options or possibilities I’m aware of in and around Grand Junction, CO (subject to making sure that any mattress you are considering meets your own criteria and the quality/value guidelines here) are listed in post #2 here. The next closest list is for the Aspen, CO area in post #4 here.
I don’t keep a record of the individual mattresses or their specs that the retailers and manufacturers in the hundreds of forum lists throughout the forum carry on their floor or have available online (it would be a bigger job than anyone could keep up with in a constantly changing market) but checking their websites and making some preliminary phone calls to the retailers/manufacturers that are on the local lists is always a good idea before you decide on which retailers or manufacturers you wish to deal with anyway. This will tell you which of them carry mattresses that would meet your specific criteria, are transparent about the materials in their mattresses, and that carry the type of mattresses that you are interested in that are also in the budget range you are comfortable with. Once you have checked their websites and/or talked with the ones that interest you then you will be in a much better position to decide on the ones that you are most interested in considering or visiting based on the results of your preliminary research and conversations.
If there aren’t any local stores that carry latex mattresses that you are interested in testing then of course you would be limited to the many online options that are available to you.
Phoenix