A recent study showed that, here, as much as 25% of the "sales" and "special offers" in supermakets were either not advantageous ( save 1 cent ) or detrimental ( get 2 bottles of olive oil at a star price of 12.99. One bottle sold alone is 5.99 ... )
Still better than what I have experienced. A week ago I saw a deal on cheese, 8 pieces in a paper box. I took one, it was a bit lighter so I tried another one and it was the same so I let it be. At home I opened it only to find only 7 pieces inside. Then I understood why the deal was.
I literally wanted to go there, find another such cheese, call the shopkeeper, open the package and make her count all the pieces. That or call the inspection.