Hi Leukhyla,
The better options and possibilities I’m aware of in the Kansas City area are listed in post #2 here. You may need to call each of them to see if they either make or carry a mattress that matches your criteria.
If your criteria excludes any type of foam at all … including natural latex … then it may be more difficult to find what you are looking for and if you do find it, it may be more costly than most types of mattresses as well. Some examples of manufacturers who make innerspring mattresses that use natural fibers without foam are listed in post #4 here. You may need to research their sites, talk to them on the phone, and probably order online if they aren’t available locally.
You may also find some futons that meet your criteria.
If you include latex in your options then your search for a safe and healthy mattress would be much less restrictive and easier.
Phoenix