Hi Lapo21,
Welcome to the Mattress Forum! 
I’m sorry your original mattress didn’t work for you as well as you had anticipated, but I’m glad you were able to get a credit for it.
The better options or possibilities I’m aware of in and around the Salt Lake City area (subject to first making sure that they carry the type of latex mattress you are interested in testing and that any mattress you are considering meets the quality/value guidelines here) are listed in post #2 here. There may be other member of the site who have more information for you about latex retailers in Utah and they can chime in as well.
Phoenix