Hi anders1011,
The better options or possibilities I’m aware of in the St Louis area (subject to the quality/value guidelines here) are listed in post #6 here.
This topic may be helpful as well.
The forum list for the Kansas City area is in post #2 here.
I would be very cautious about brand shopping because you are buying a specific mattress not the brand and all manufacturers have access to the same or similar components and materials. Most of the more heavily advertised and most commonly available brands that you would recognize are the ones I would avoid anyway (see the guidelines here) and many of the better manufacturers are smaller and are only available locally or regionally (or online). The name of the manufacturer on the label also won’t tell you anything about whether a specific mattress would be a suitable choice in terms of PPP (Posture and alignment, Pressure relief, and Personal preferences) or whether there are any lower quality materials or weak links in the design that would affect the durability and useful life of the mattress. There is more about the risks of brand shopping in post #5 here and post #12 here. Outside of careful testing for PPP (hopefully using the testing guidelines in the tutorial) … I would focus much more on the type and quality/durability of the materials inside a mattress (which are important to know anyway) than I would on the name of the manufacturer on the label.
Phoenix