Hi xfarmer,
You’re right that you are a long way from any mattress stores that carry latex that I’m aware of or could see in a search in Scottsbluff, Torrington, or Alliance…
The closest store that carries any latex that I know of would be Denver mattress in Cheyenne, WY.
The next closest options I’m aware of would be in the Fort Collins, CO list in post #4 here where there are many more choices but of course they’re a fair drive away.
Phoenix