I love a good bargain.
At the supermarket today I spotted several packets of 7 pairs of undies age 8-10 on sale. $6. 39 a packet. My daughter was in need of new ones so I popped them in the basket. At the checkout however they came out at full price, so I politely queried this. After a quick check of the label on the shelf the undies came out at the said $6.39 as I thought. I was happy with this, but even happier when the checkout lady told me that their scanning policy was, because they had scanned incorrectly that I get one packet free. Brilliant, cheaper and free.
So I purchased 21 pairs of new underwear for a grand total of $12.78.