it may have been a price mistake but then you it rang up at $99 and had a $99 tag on the shelf.
there were 3 at my store and the 3 people were able to purchase them and leave before the manager told the rest of us that they wouldn't honor the price mistake.
I love this mindset, no forgiveness or exceptions for any mistakes, ever. I dont know how you got through your entire life and professional career without telling someone something that you had to later take back. People and price mistakes are like vultures.