I'm coming to Montreal for a few days and want to find a large supermarket with great prices and selection on McAuslan, Unibroue etc., products. I already have a couple recommendations for depanneurs but I want to save money if possible, and grab some groceries too. Loblaws? IGA? Other chains? Specific stores please; I'm staying near Crescent and Ste. Catherine and have access to a car.