You will like the Dollarama here ! Most of its products are made in China like the dishes,cups, glasses, shampoo and facial cream, all sorts of kitchen wares, etc. are only $1 each, that cuts off most of your luggage weight. I found the shop is very handy and there are quite a few spreading out in down. But for clothing, better bring them with you coz they are not cheap here.
Welcome to Montreal