Unfortunately this is fairly common in much of the mainstream industry and the types of mattress stores I would tend to avoid.
The better options and possibilities I’m aware of in and around the Fayetteville, AR area (subject to the quality/value guidelines here) are listed in post #4 here. You will need to check their websites or make a few phone calls to see if any of them carry mattresses that fit your criteria or that you would be interested in testing.