It's called Dollarama. There is one on St. Laurent Blvd. But not in that shopingmall. You have to walk 10 minutes from there. It's on the side of the Honda dealer. Walk in north direction. Cross one more street after you seeing Zeller and Loeb.It will be in a small shopping center on your right side.
If you don't want to to walk. There is another one right on the bus route. It's in Claingwood Mall. Bus 85 will take you right there. But, it's a long ride from Lees.