John,
When my son and I go each year, it does add up. There are the adjoining states of Idaho and Montana as well as the Park license.
Non-resident licenses are pretty high, frankly. The problem for us is that all three areas are possibilities each day we're there as, depending on weather, stream conditions (hatches usually), and crowding we might fish one or more each day and so we have to plan our license purchase accordingly. And, each jurisdiction seems to have different time periods of purchase; i.e., 3 day, single day, etc.
Just a fact of life when fishing areas close to different jurisdictions.
Here, for example, is the Montana non-resident options:
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