I needed to buy cheap plastic business card holders for a project I was working on. I looked online and found some at Office Depot for $2.13. Since I didn't want to pay shipping, I just printed out the product page (which said I could get it at the store for the same price) and headed over to the store across the street from where I work.
At the store they had these stupid hunks of plastic for $15 each. I needed 5, so I grabbed them, but there was no way in hell I was spending $75 for 5 plastic business card holders. I brought the online printout to the service desk and let them know the price was wrong at the store. The manager told me that I was a "thief printing out a forgery" so I told him to go look online himself. He went online and found the product at the same price I did. Then started swearing and pulled out his price policy book, slamming in down as hard as he can in front of me. Sure enough, they had to honor online prices like the web page said.
The manager turned to me and said, "Well I guess you win, but it is ---smurfs--- like you that are destroying the Office supply retail Industry." I left a few choice words with him as I left with my card holders, but I could see the dude needed an enima. Asshat.
I guess my whole point is that it is not the job of the customer to interpret what prices are mistakes, and what prices are reasonable to believe correct, we are not product purchasing analysts. I don't think that $75 for 5 clear plastic business card holders is correct, but that dude somehow though I was ripping them off and thought the $2.13 was a price mistake.