Hi Roxanne,
Welcome to the Mattress Forum!
I’m glad that you’ve taken the time to read through some of the forum and educate yourself about mattresses and their components. Thank you!
The better options or possibilities I’m aware of in and around the Nashville area (subject to making sure that any mattress you are considering meets the quality/value guidelines here ) are listed in post #7 here . There are few more listed there than what you mentioned.
I’ll be interested in learning about your shopping experiences and any other questions that may arise.
Phoenix