Hi Springy,
Subject to first confirming that any retailer or manufacturer on the list that you wish to visit is completely transparent (see this article) and to making sure that any mattress you are considering meets your specific criteria and the quality/value guidelines here … the better options or possibilities I’m aware of in and around the New York City region are listed in post #2 here.
It may be worthwhile calling the manufacturers on the list I linked in my last reply to see if they have any dealers in your area.
I don’t keep a record of the individual mattresses or components or their specs that the retailers and manufacturers in the hundreds of forum lists throughout the forum carry on their floor or have available online (it would be a bigger job than anyone could keep up with in a constantly changing market) but checking their websites and especially making some preliminary phone calls to the retailers/manufacturers that are on the lists that you are considering is always a good idea before you decide on which retailers or manufacturers you wish to deal with or visit anyway. This will tell you which of them carry mattresses or components that would meet your specific criteria, are fully transparent about the materials and components and/or the mattresses that they sell, and that carry the type of mattresses or components that you are interested in that are also in the budget range you are comfortable with. Once you have checked their websites and/or talked with the ones that interest you then you will be in a much better position to decide on the ones that you are most interested in considering or visiting based on the results of your preliminary research and conversations.
Having said that … out of the ones in the New York list off the top of my head I believe that Norwalk Mattress, My Custom Bedding, Charles H Beckley, The Clean Bedroom, and Longs Bedding all make and/or sell two sided innerspring/natural fiber mattresses.
Phoenix