Hi vektro,
I just updated post #6 here which includes the better options in the St. Louis area. They include some very good “testing” options (Savvy Rest for example has a choose your own layer mattress with 3x3" layers) as well as some better value options as well. The PLB line would also give some good indications of the type of layering that may work best for you and your preferred model could be helpful guideline.
here which is one of the Olejo websitesI purchased my adjustable bed (the Reverie Deluxe) . They have some of the best prices on the internet, their service and help was great, and they have free shipping.
Hope that helps.
Phoenix