for places to play in montana, your best bet would be to go to
www.usba.net which lists by states various poolrooms and their associated equipment.
Mr 3-cushion jogged my memory, back to some 35 years ago when i was a relief tech based out of seattle who relieved techs in spokane, helena and billings. At that time, billings had one carom table in a corner pocket poolroom. Helena had none.
Spokane had a room in downtown area with 3 old brunswicks.
From the map, looks like you are closest to spokane. But checkout the usba site, i'm sure that they have a more up to date listing.