Hi Violette,
You are correct … SleepEZ uses 100% natural Dunlop latex and Plushbeds uses organic Dunlop (there is no such thing as organic Talalay so any talalay in either one wouldn’t be organic).
There is more about Organic Dunlop latex in post #6 here and about organic certifications in post #2 here.
The tutorial post also includes this link to the members here that sell online and many of these make latex mattresses that use different types and blends of latex with a wide range of different features and options and price ranges and some of these also have organic latex options available as well.
There is also more about organic, natural, green, and “safe” materials in post #2 here and the posts it links to because many people that are looking for “organic” materials are often just looking for materials that they can have confidence are “safe”.
Phoenix