I never heard of that. But it makes sense. I used to keep notes in my phone about prices so that I could compare. Occasionally, I'll still check prices when I'm in a store on Amazon or maybe Costco. But mostly, I just try to shop at the lowest priced stores like Aldi. I know that there are times that the local supermarket has things at a lower price than Aldi but overall I'm saving a ton of money by shopping there for the majority of my groceries.