Wish I could recommend some people up in the mountains but other than Sanders Sound, which is a manufacturer, not a dealer, don't know any.
It's been a couple of years since I was in Apsen, but at one time there were:
Audioquest of Aspen
Electronics Technology Group
Aspen has quite a few custom installation type dealers. No show rooms, but can sell and install systems.
If you have time in Denver, here's some more:
Cherry Creek Audio
Sounds Hifi in Denver is currently showcasing the Vienna Acoustic Die Muzick speakers as well as the new Rowland Criterion 2 chassis battery powered linestage. They are in fact the very 1st high end store in the USA to have a Criterion to demo. Call them at 303-759-5505 and ask for Rod, who is a good friend of mine.