Hi seth4ut,
Post #2 here includes links to some of the better forum posts and topics about mattresses and children and they also include links to some of the better choices I’m aware of as well.
The better local options or possibilities I’m aware of in and around the Nashville area (assuming that’s where you are in central Tennessee) are listed in post #7 here but I would always make sure that any manufacturer or retailer you are dealing with can provide you with the details of all the materials inside any mattress you are considering before you buy it.
Phoenix