> The store must honor the price in the advertisement, even if it is wrong, until they correct the misrepresentation using the same advertising medium and/or by corrective signs in the store.
> Items sold in a grocery store must ring up at the lowest displayed price. Food stores that are in the waiver program must offer consumers one of the items free if it scans higher than the lowest advertised price.
[1] https://www.mass.gov/guides/a-massachusetts-consumer-guide-t...