Hi sleepless in colorado,
Subject to first confirming that any retailer or manufacturer on the lists you wish to deal with is completely transparent (see this article) and to making sure that any mattress you are considering meets your specific criteria and the quality/value guidelines here … the better options or possibilities I’m aware of that would likely be closest to you would be in the Aspen, CO list in post #4 here. A little further away the Denver/Boulder, CO list is in post #2 here and the Grand Junction, CO list is in post #2 here (although there aren’t a lot of options here).
The major brands such as Sealy/Stearns & Foster, Simmons, and Serta all tend to use lower quality and less durable materials in their mattresses than most of their smaller competitors that will tend to soften or break down prematurely relative to the price you pay which is why I would generally suggest avoiding all of them completely (along with the major retailers that focus on them as well) regardless of how they may feel in a showroom along with any mattress where you aren’t able to find out the type and quality/durability of the materials inside it (see the guidelines here along with post #3 here and post #12 here and post #404 here).
The 3/4" GelTouch Foam and the 1" Luxury Firm Comfort Foam and the 1/2" Energy Foam in the BeautyRest Katherina extra firm are all polyfoam. They are all less than 1.8 lb density and are lower quality/density foam materials than I would consider and would be a weak link in terms of the durability and useful life of the mattress. Like all the major brand mattresses I would avoid it.
Phoenix