There aren’t a lot of great choices right in Jacksonville but post #7 here includes some of the better ones and I would personally take the drive to Holly Hill and visit Fox Mattress. (An hour away from Jacksonville) They are members of this site … meaning I consider them to be among the best of the best in terms of quality, service, and value … They are a local factory direct manufacturer that makes all types of mattresses. I have had some great conversations with Rick the owner and he is exceptionally helpful and knowledgeable, and I think a visit to a knowledgeable manufacturer or outlet who is “on your side” can save a lot of frustration and even time mainly because you will get accurate information from people who really do know what they are talking about and you would know ahead of time that you were testing mattresses that really did have better value than most of the other options available to you closer by. They would be well worth a drive to Holly Hill to include them in your research.
Hope this helps
Phoenix