I usually use the calforex on rue peel, im not going to have time to get down there when i get in.
Ill be near st denis close to the bus station on berri, whats the best currency exchange on this neighborhood?
I did all of my exchanges in Montreal in TD bank. They don't require an account (at least they didn't when I was there) and buy at a pretty good rate. If memory serves, there is one right by the Tourisme Montreal center on Rene Levesque
