Hi MIMEWA,
There are very few good options that I’m aware of in the Flagstaff area (see post #2 here) and if I was in your shoes I would probably take a day trip to Phoenix where there are many great options available in the area including 3 of the members of this site which all make some great quality/value latex mattresses.
A trip there will give you the chance to compare the feel and performance of various latex mattresses with Tempurpedic memory foam mattresses but latex and memory foam are very different and aren’t directly comparable to each other (see post #2 here)
Phoenix