Well Pueblo Supermarket's here on St Thomas just got wacked for large fines for irregular pricing practices. They had thousands of items marked one price on the shelves and they were scanning for higher prices at the register. Apparantly all of the errors were to the high side, which likely makes it a scam as opposed to a mistake.
Here is a link to the article in the paper. http://www.virginislandsdailynews.com/index.pl/article_home?id=17625213