Hey Insearchoffit,
Welcome to the mattress forum :).
I made a new thread for your post, thank for sending it.
Regarding the terminology, some of the retailers and brands do “play games” with their marketing. And your instinct is correct, most likely the ones called “natural” are probably a blend. Yes, less expensive, but not lower quality, just a different formulation. Most of the companies on our mattress membership listingwill be clear about whether the formula is blended or 100% Natural. Some companies will clearly say 100% natural formula, and it is a very legitimate claim.
If you’re interested there is some good information in this Latex mattress post.
For some people, no Talalay can be a drawback, but for others, it would be perfectly fine, the same thing with the 9" it can be a great fit for some, but not for others. Your preference for liking the 12-inch design is important. And possibly with a Talalay choice, you may find the right fit, with 9, 10 inches. As you try other mattresses, you will be able to tell if less than 12 will work.
Let me know if you have other questions or updates from other stores.
Thanks,
Sensei