I was in the grocery store the other day, the day after their ground beef was on sale.
Their current price was nearly double the sale price.
No, I didn't want to have to pay the higher price if I could help it.
Know what I did?
I looked through the other shelves of ground beef. Know what I found? Packages of ground beef already marked as the sale price from the previous week.
Since most meat departments print the labels ahead of time, most don't go back and "fix" them for the higher price. It paid for me to be persistent and look around for packages already marked lower.