I had a weird reverse to this situation at Home Depot. I need a 10 foot section of galvanized pipe cut into three equal pieces and threads on both ends. When I held up the label for the scanner it registered the 17 dollar price but the lady entered 3 for the quantity and I was charged 50 plus bucks. I had a bunch of other stuff in the cart and only thought about it as I was loading the car. I pulled out the receipt, looked at it and reached down for the pipes and walked back into the store. The guy who did the refund laughed about it but I didn't. He says, good catch, he knows we don't really watch the ring up and are not bothered with 230.00 on the card.
That is a cheap run to HD sometimes.