Hi domo,
You may have seen this but just in case you haven’t … some of the better options and possibilities I’m aware of in the Kansas City area are listed in post #2 here. Some of these sell latex mattresses so you can see the significant differences between memory foam (like Tempurpedic) and latex.
Just in case you haven’t read this as well … post #1 here includes links to much of the basic information that you may find helpful
Phoenix