The savings at Wholesale Club in Esquimalt are equal to SuperStore, but it's such a low frills setup in there that many people don't like it. You will save tens of dollars with every trip to that store compared to Save-Ons or Thrifty's. If you're buying $300-$400 per trip you'll walk away with $50 in savings easily.
Regarding Costco, some items might cost you the same as other stores, but you get a higher quantity in the box. If you play the Costco runs right you're going to see huge savings (gasoline alone; and even more-so if you're buying premium fuel which is consistently 15 to 20 cents cheaper at Costco)