Hi Jjpsmile,
Post #143 here includes the better “possibilities” in the Tampa area that I’m aware of 
It may also be worthwhile reading the overviews in the mattresses section of the site to give you some idea of some of the different materials and constructions that can be used in a mattress and the pros and cons of each. Scanning these (I wouldn’t “study” them) can also help you ask better questions which can lead to better choices.
I would also suggest reading this article which will save you some time and give you an idea of which outlets may be the most knowledgeable and helpful. It will also give you a sense of what to expect if you pay them a visit and help you choose between them.
Hope this helps.
Phoenix