MT fishing license

[Flyfis4fun]

I am off to Montana tomorrow for 4 days.  We are headed to a family reunion up towards 
Kalispell but I would love to hit the Henry's Fork on the way there.  Anybody know of 
an easy to find location to buy a fishing license off of I-90?

Question number two- Given your choice, would you fish the Thompsen River or Swan 
River?

Mike