Hi Maxie,
I’m glad you found us … and welcome to the forum 
Just in case you haven’t read it yet … I would start by making sure you’ve read the mattress shopping tutorial here which has all the basic information, steps, and guidelines that can help with how to make the best possible choice.
Once you are ready to start testing mattresses then the better options and possibilities I’m aware of in the Denver area (subject to the guidelines here) are listed in post #2 here.
Phoenix