Hi September,
Welcome to the Mattress Forum! and I’m glad the information here has been helpful.
There isn’t any certified organic Talalay but there is 100% natural Talalay. They are correct that blended Talalay is generally more durable than 100% natural Talalay … particularly in the softer versions. There is more about 100% natural Talalay vs blended Talalay in post #2 here.
Depending on the direction the better options or possibilities that I’m aware of that are reasonably close to you are listed in post #2 and #4 in the topic we are posting in along with the list for the Poughkeepsie/New Palz area in post #4 here although I would probably stick with the lists that are in this topic.
I don’t keep a record of the individual mattresses that the retailers and manufacturers in the hundreds of forum lists throughout the forum carry on their floor (it would be a bigger job than anyone could keep up with in a constantly changing market) but checking their websites and making some preliminary phone calls to the retailers/manufacturers that are on the forum lists that are in reasonable driving distance is always a good idea before you visit any store anyway. This will tell you which of them carry mattresses that would meet your specific criteria, are transparent about the quality and durability of the materials in their mattresses (see this article), and that carry the type of mattresses that you are interested in testing in the budget range you are comfortable with and that have exchange or return policies that 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 visiting based on the results of your preliminary research and conversations.
Phoenix