mackeyapp, if you're only watching flights from YHZ your experience may be different from posters using US carriers. Since CanJet is no longer an option for you, I would look at all realistic US entry points and make a list of all the airports you could reasonably fly from, if they are even an opton. Price out getting to that city, travel time, cost of parking the car, and hotel accommodation and add that onto the price of flying from the US. It may not even be a viable option.
Then go to travelocity.ca and sign up for their automated email alert for city pairs - it will email you whenever the price drops.
Note however that Air Canada has been pulled from the travelocity engine so their fares won't show automatically when you do a fare search. Also use United.com to search (use the advanced search feature and add AC as an airline). I often fly AC to LAX but get a cheaper fare by booking off United.com vs Aircanada.ca