Hi sleepygirl,
The closest list to you is for Baltimore, MD here. I know you’ve probably seen it but I thought I’d add it just in case and I added a couple of options to it as well.
I certainly understand the importance of an exchange policy for some people and it makes sense to find out all the details for the retailers you visit so you can add it to your “value equation”.
What I would suggest is to call and talk with any of the retailers you plan to visit and make sure they carry the types of mattresses you want to test (latex/innerspring hybrid, polyfoam/latex hybrid, all latex etc). In many cases websites are not up to date so I would always talk to a retailer in person and ask some specific questions … including whether they have all the information about the layers in their mattresses … before visiting them. This will give you a much better sense of the type of knowledge and service to expect when you get there.
You can read a bit more about latex allergies in post #2 here. Because the surface proteins that are the main cause of latex allergies have been washed off (unlike products like gloves and condoms) and because the latex is covered … latex allergies don’t generally present a problem with mattresses and there are many retailers who have gone decades without ever seeing a latex allergy problem. Of course for someone who has the much more rare type 1 allergy then this would be a different story.
I think that some of the most important things to keep in mind are to make sure you test each mattress you are seriously considering for long enough (at least 15 minutes fully relaxed on each mattress) and in all the positions you usually sleep in. You can see some suggestions for testing for pressure relief here and for testing support/alignment here and in post #11 here. Besides this … enlist the help of knowledgeable salespeople … and if there seem to be two similar options I would tend towards firmer rather than softer. You can always “fix” a mattress that is too firm by adding a topper but its much more difficult to fix a mattress where the support core is too soft or the comfort layers are too thick and soft. If you take your time and trust what your body is telling you and never buy a mattress on the same day you are testing them (so you can go home and check to make sure it has the quality and value you want) then your odds will greatly improve of making a great choice.
Phoenix