Hi marshter,
I did some more research over the last few days (online and on the phone) in the White Plains / Scarsdale, NY area and there is little to nothing in the immediate area that would be in the same value range or have the same knowledge as the manufacturers and retailers that I listed in the NYC link and in the Connecticut link in my last reply. If I was in your shoes I would take the time to fist phone and then visit some of these. I did add a couple of options to the Connecticut list.
If I did have to shop locally (within 20 miles or less) then I would reluctantly consider these but neither of them seemed particularly knowledgeable about the materials in their mattresses which means that you would likely be making a blind purchase (or have to call manufacturers about the specs of their mattresses) which I don’t recommend.
http://www.futonisland.com/ Yonkers, NY. Carries GoldBond mattress including their gel memory foam but none of their latex. They didn’t seem very knowledgeable about their mattresses much less what was in them.
http://info.ikea-usa.com Paramus, NJ. See post #3 here for some of the better value here.
http://www.hcmattress.com/ Mt Kisco, NY., Westport, Danbury, CT., Ridgewood, NJ. Carries their own line of latex mattresses made by Restopedic that are well designed and high quality mattresses but also have a more premium price so I would make some careful value comparisons here.
There may be some better choices a little further away.
In the NYC direction … there is a list of some of the better options and possibilities I’m aware of in post #2 here and post #7 here (Monroe Township, NJ) has a more categorized list with more detailed descriptions of some of them.
In the Connecticut direction Post #2 in this thread has a list of the Connecticut factory direct manufacturers and some of the better retailers that I know of.
There are some very good choices available to you within reasonable driving distance.
Phoenix