At the 2 major chain Canadian grocery stores I regularly visit (Save-On and Superstore) prices can vary wildly every time I'm at the store. With Chocolate bars,

At the 2 major chain Canadian grocery stores I regularly visit (Save-On and Superstore) prices can vary wildly every time I'm at the store. With Chocolate bars, coffee and butter the price fluctuations are especially violent. I'm not up to date on Cocoa or Coffee bean futures, but the Canadian butter supply chain is not so unstable that the price ought to be varying from $5.50 to $8.50 on a regular basis! I'm not even sure what kind of game it is they're trying to play. Like, what are they hoping to achieve by jerking their customers around this way?