I have heard of a new restaurant with gluten free options from a couple of my friends so I have to share it with everyone else. The Smiling Moose Deli offers sandwiches and soups that are or can be prepared gluten free. I don't have any other details on the food and I do not know what practices they follow to prevent cross contamination in the kitchen. Be sure to check they are up to your standards if you stop in to give them a try.
The Smiling Moose Deli is located at 2631 West Main in Bozeman and they can be reached at 406-585-2922.