Hi Kathryn,
That’s a lot of reading 
The better options I’m aware of that are within reasonable driving distance are included in post #2 here. There were two lists centered around Mankato, MN so I combined them into one and based on a search around Austin, MN there are no others that I would add with the possible exception of http://mankatomattressman.com/ who hasn’t called me back yet to let me know what they have on their floor and how much information they are willing or able to disclose about the materials in their mattresses.
NOTE: He called me back and I have added them to the Mankato list and you can see my comments there
Phoenix