Hi JMichael,
Different members sell different mattresses that range from latex, memory foam, and innersprings along with various hybrids depending on which ones you are looking at but it would be a good idea to do some local testing to get a better sense of the types of mattresses and materials you tend to prefer.
The better options and possibilities I’m aware of in and around your area (subject to the guidelines here) are listed in the Baltimore list in post #2 here and in the Leesburg/Frederick list in post #2 here (with some overlap between them).
Phoenix