Hi Bee28,
The better choices in the Nashville area that I’m aware of are listed in post #7 here.
A step by step guideline for how to find the best quality/value mattress for you is in post #1 here. this will help you avoid most of the worse choices and focus more on the better ones.
I don’t know which of these include financing options but I would also be careful with this because the rules of 0 cost financing can be very stringent and with a single late payment the costs can be added retroactively. Everything has a price … even if the price is “hidden”.
The prices at mattresses unlimited can be somewhat high. For example if you look at this latex hybrid mattress … it is over twice the price of similar mattresses available from some of the members of this site listed in post #21 here and more than several all latex mattresses as well.
Phoenix