Hi Tom67,
Welcome to the Mattress Forum! 
I’m sorry your past few mattresses haven’t held up very well for you, but as you’ve been doing some reading on the forum you now realize that they didn’t contain very durable materials. Hopefully you can address that with your next mattress with the information you’ve gathered here!:cheer:
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 .
Phoenix