My usual fish shop where I get most of supplies for the hobby. I stopped buying fish from big als because they were always either sick or infected with something. At this place I have not been burned as such yet. Good mix of price and selection, and steve does fair trades as well.
Dragon aquarium has a decent amount of saltwater fish and invertebrates. Their prices on livestock seem a bit lower than Big Als' Mississauga, and their prices on supplies seem a bit more, but overall their prices are fair.