Hi Celicook,
Some of the better possibilities in the Atlanta, GA area are in post #2 here.
Keep in mind that no matter where you go or where you buy from that a mattress is only as good as the quality of the construction and materials that are in it so make sure that the retailer or manufacturer you are working with can provide you with the details of every layer in any mattress you are seriously considering. You can test for comfort/pressure relief and support/alignment and many other preferences (such as motion transfer or overall “feel”) in a showroom but you can’t feel the quality or durability of materials in your testing (which determines how long the comfort and support will last) so the only way to make meaningful comparisons with other mattresses and to know the quality and durability of any mattress is to know the details of all the materials inside it.
Phoenix