Hi fixmenow,
The quality durability guidelines I would suggest are in post #4 here (they were included in one of the links in my previous reply).
I don’t know because I don’t keep a record of the individual mattresses or their specs that the retailers and manufacturers on ebay have available online (it would be a bigger job than anyone could keep up with because they are constantly changing) but checking their listings and making some preliminary phone calls to the sellers is always a good idea before you decide on which retailers or manufacturers you wish to deal with anyway. This will tell you which of them carry mattresses that would meet your specific criteria, are transparent about the materials in their mattresses, and that carry the type of mattresses that you are interested in that are also in the budget range you are comfortable with. Once you have checked their listingts 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.
Phoenix