Check all the Pilot stations. We have one here in Cheyenne that sells 93. If you're specifically referring to 100 or higher you'll have to check into specialty shops. Some motorcycle performance shops will carry race gas otherwise you'll have to look for a VP or Sunoco importer.
You can get leaded from Chief Petroleum off of Colorado Blvd, leaded and unleaded from Laniers (I think that's what it's called), and that's it. There's a place up by Castlerock that sells 100 oct at the pump 24 hrs a day that I know of as well.
Leaded 112 at Chief is the best bet, because it's only $4.50/gal. I used it (not 100%, but a mix) for pretty much all of the last 2 years before switching to E-85.
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