Hi CarrieP,
The better options or possibilities I’m aware of in and around the Boston, MA area that would include Burlington, MA (subject to making sure that any mattress you are considering meets the quality/value guidelines I linked in my last reply) are listed in post #2 here.
You certainly have some good options available in the area and I would make sure that you include a trip to Spindle Mattress who is one of the members of this site and sells a great quality/value component latex mattress that uses 100% natural continuous pour Dunlop latex that is made in the US (by Mountaintop latex) and has a wool quilted organic cotton cover.
Phoenix