Hi lisaS,
You’ve probably read this but you can see my more detailed comments about the Saatva mattress in post #1 here.
The best place to start your research is with the mattress shopping tutorial here which has all the basic information, steps, and guidelines that can help you make the best possible choice. It also includes several links to lists of some of the better online options I’m aware of.
The better options and possibilities I’m aware of in the Syracuse area (subject to the guidelines here) are listed in post #2 here.
Phoenix