Hi abuscare,
I should have mentioned that the better options or possibilities I’m aware of in the Jackson, MS area are listed in post #2 here.
If it’s at all possible … I would probably make your purchase closer to home because 3 of the members of this site that normally sell online and which all offer great quality/value mattresses are based in the Phoenix area and for those that are fortunate to live nearby they would have the option of testing their mattresses in person instead of ordering them online. Phoenix is one of the best places in the country to buy a high quality/value mattress. They are all included in post #4 here for the Phoenix area.
Phoenix