Hi Shazb0t,
Off the top of my head I can’t think of any major brand mattresses that are all latex that would approximate any of the online all latex mattresses.
I would probably suggest taking the opposite approach though.
Pure Latex Bliss has some all Talalay latex mattresses and some of these may be “somewhat” of an approximation to some of the mattresses made by some of the members here that sell latex mattresses online but you would need to compare the specific PLB mattress you were most interested in or that was the best match for you and then ask them to help you “translate” it’s design to help you decide which of the mattresses they make (if any) may be a reasonable approximation. The PLB website has a retail store finder on their site here.
There are also a number of retailers or manufacturers on the list that sell all latex mattresses of various types and designs and I would also test these to see which one you preferred and was the best match for you in terms of PPP. Once again I would then look at the smaller online list and talk with them to see which of them made a mattress that may be a reasonably close approximation to the one you preferred and that you also thought had better value based on the criteria of your personal value equation that were most important to you.
Starting locally rather than online would be much easier than the other way around (if you plan to do both) because you would have a specific mattress you could use as a point of reference in your discussions with any of the online manufacturers you were considering.
Phoenix