I was at Superstore this evening and found the Boost to be on sale for 6/6.99, Ensure was 6/7.97 and Presidents Choice for 6/5.99. This is the cheapest I have found so far so I bought a supply for after my surgery. I'm not sure how long they are on for but hope to check Winnipeg on Monday and if they are still on sale I may pick up a few more. 

edit:
I went to their website and looked up their weekly flyer. The sale is on until July 28th!  Maybe I  can find some vanilla in Winnipeg as Steinbach had mostly chocolate and strawberry.

ohhh!!  thank you for letting me know!!
i will grab a whole bunch too!!

Where are you buying your Whey Protein powder from?