Hi color,
The better options and possibilities I’m aware of in the Atlanta, GA area (subject to the guidelines here) are listed in post #2 here.
The Berkeley Ergonomics mattresses certainly use high quality materials but the most important part of a mattress purchase is always PPP and this is a separate issue from the quality and duability of the materials so when you can’t test a mattress in person then the options you have available after a purchase to exchange or return a mattress (or individual layers and components) if the mattress doesn’t turn out to be as suitable a choice as you hoped may become a more important part of your personal value equation.
The official recommendations of the site are the members that are listed here but there are also many other great choices across the country as well.
Only you can decide whether any additional risks or uncertainty involved with an online purchase is “worth it” to you and it would depend on the specifics of the mattress you are considering and on the other options you are comparing it to but post #12 here includes a list of the Berkeley Ergonomics retailers I’m aware of and I believe that at least some of them will ship their mattresses anywhere across the country.
Phoenix