Distribution Alimentaire Aubut Inc
3975 rue Saint-Ambroise
5650 boulevard Métropolitain Est
Presto Les Entrepôts
5400 Henri Julien
Club Entrepôt Provigo
Or you could just look in the yellow pages under groceries wholesale: http://yellowpages.ca/search/si/1/Gro...
As for butter, I always stock up on unsalted when it goes on special at 2.99. I stick it in the freezer so I always have a supply for baking. Loblaws has icing sugar and flower in bulk bags (usually where they have those boxes of spices, and breads and cakes) but I don't know how much you need and how much of a saving it will be... but it is cheaper than the Redpath icing sugar and brand name flours.