Hi russmcb,
The better options or possibilities I’m aware of in and around the Salt Lake City/Provo area I’m aware of (subject to making sure that any mattress you are considering meets your criteria and the quality/value guidelines here) are listed in post #2 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 (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 lists is always a good idea before you decide on which retailers or manufacturers you wish to visit 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 testing.
Phoenix