Hi BryanR,
I didn’t have a “list” for your general area so this was my project for part of last night and this morning (when I could actually talk with some of them)
Of course the research isn’t “complete” and you would still need to know the details of specific mattresses you were considering but it will give you a leg up on where to focus your time and energy and perhaps most importantly who and what to ignore. There are more that I didn’t list that what I did.
The “choose your own” layer type of latex mattresses are more typically found with online manufacturers that offer the chance to replace layers if you make a choice that your sleeping experience tells you isn’t exactly what you want. This can help offset the “risk” of an online purchase and also has the benefit of being able to replace an upper layer if it wears faster than the lower layers or if your needs change over the years. They are much less common with local purchases although many smaller factory direct manufacturers will change out a layer after a purchase if it needs to be adjusted.
The closest similar mattress to you that I know of would be here http://www.thenaturalsleepshop.com/products-savvy-rest.html although they are significantly more than some of the online choices offered in post #21 here which use the same materials and similar layering options. I generally use a guideline that if an online purchase is @ 20 - 25% less than a similar mattress available locally then it may be worth the extra risk of looking online. any local testing of course can help provide a guideline for an online purchase as well if you know the details of what you are testing.
There is also one other retailer in Fairmont that I didn’t mention that used to carry the Pure Latex bliss mattresses (which are all Talalay latex) but only has one left which is a King size Nature. If it “fits” your needs and preferences it may be available at a reasonable price. They don’t plan on bringing in the new PLB models and other than that only carry Serta which is why i didn’t list them.
Several of the choices I listed may have an “all latex” mattress because I know several of the manufacturers I mentioned make them so some quick calls to ask “do you carry an all latex mattress” will fairly quickly tell you which the are. Even if you don’t end up making a purchase from them … the testing and experience may be helpful.
Phoenix