I was reading an article about the 5 Montana Rivers to try on a budget. The article entitled "Fishing the West, on a budget, on your own. Five rivers to try" by By Dennis Anderson was published in the Minneapolis St Paul Star Tribune and in it Dennis explains how to approach and how to fish the rivers without spending a great deal of money. In all instances guides are available, but Dennis has suggestions for going it on your own.
Of course, the infromation is not new as these are some of the more famous rivers in the USA and here hey are:
2. Yellowstone
Also, you might want to try Henery's Fork and the Firehole Rivers as well. What a trip!