Live in Missoula long enough, and you'll start to notice the work of a regular cadre of illustrators. Their work appears not only on sketch paper, but on t-shirts, note cards, posters, jewelry, comics, bookmarks, local product labels...the list goes on.
This group of artists ranges from the well-known and highly successful Monte Dolack to a relative newcomer like Joshua Bacha (@moon_booger), whose psychedelic work can be seen on local concert posters.
If there's an artist whose work appeals to you, support them! Many of these creative folks sell their art at the Missoula MADE Fair, the People's Market, and local shops like Rockin Rudy's and Shakespeare & Co. If you're short on cash, cruise the downtown bulletin boards to score some poster art (albeit with a few holes).