I have just picked up a rental car in Sacramento and asked for a Canadian non-resident insurance card so that I can take the car into Canada as part of my trip. However the counter said they do not have any and that I would have to pick one up closer to the border.

Can anyone confirm that I will be able to visit any Avis counters in say Montana and get one of these cards? Ideally I would pick one up before then as it will be more convenient. I am heading east towards Salt Lake City, then up to Yellowstone, Glacier national park and across the border near there.