Since your in TO, there is a place on Kennedy and Ellesmere(north of ellesmere) and they sell $10 bb targets. It has a sticky surface so the bb's don't fall and you can see where ur shot landed. They fall off eventually and collect in a tray. They are made of mostly plastic and higher fps guns might break the plastic behind the actual target, but you can cover the back of the target with duct tape and it should prevent the plastic from shattering and falling apart. It's good for indoor shooting.
The place is called XS Cargo, the website is xscargo.com and you can see store inventory also.