What a fantastic store!
If your favorite department at the Superstore is Nature Value, then Ambrosia is a must visit! They have pretty much anything I am looking for from basic ingredients like nut butters, earth balance and vegenaise to harder to find stuff like vegan carob chips, various flours (quinoa/chick pea/tapioca) and soy milk powder. The prices are great and they have weekly specials that makes it even better. The interior is like a warehouse but don't let that stop you.
Worth the drive to Thornhill!