I've heard good things about fishing in South Alberta. I remember catching pike and trout and stuff like that. I presume the same applies to Montana. $600 might be interesting and worth it to sit in a motor boat on a lake and have a guide coach you. I'm not sure if you're required to bring your own gear though.
Anything less than that, I would presume saving the $600 driving up to a gas station and asking a local or two about the best fishing in the area (casting from the edge of a lake or similar) would more than suffice.
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