Hi Mama M,
Welcome to the Mattress Forum! 
Just for clarity, I don’t make recommendations for stores unless they are a vetted member here of the site.
Aside from that, and subject to first confirming that any retailer or manufacturer on the list that you wish to visit is completely transparent (see this article) and to making sure that any mattress you are considering meets the quality/value guidelines here … the only options I’m aware of in your immediate area that I would consider are included in the Jackson, MS list here. There are also links to the forum lists along the Gulf Coast in post #3 here.
If you are comfortable with a longer drive then some of the options in the Baton Rouge list here may be worthwhile calling and/or visiting since there are several factory direct manufacturers in the area that would be well worth considering.
I hope that helps.
Phoenix