In CA you don't get a 'bounty' for reporting scanner overcharges. But you do get good karma. :)
The Office of Weights and Measures has jurisdiction over prices and scanner issues.
http://www.dca.ca.gov/r_r/weights1.htm - find your county here.
From
https://www.dca.ca.gov/dca/press_releases/2004/1231.htm New Laws for California Consumers - California Department Of Consumer Affairs:Prices: Overcharges – AB 1721 (Koretz, D-West Hollywood) – Prohibits any person or store from charging an amount greater than the lowest price posted for a product, even if there is an expiration date posted for that product. This law clarifies that expired sale signs that are not removed must be honored by the merchant. It also clarifies the language of the law to cover scanner overcharges.
This law amends Section 12024.2 of the Business and Professions Code of CA.
A store that overcharges customers at checkout is required to refund the difference between the posted price and the scanned price, and promptly fix the problem. Consumers are encouraged to report overcharges to their county's Office of Weights and Measures, who will then inspect the store. If the inspector is overcharged for the same item, the store is fined $100 or $1000 depending upon the cost of the item.
BTW this means that if a sale sign hasn't been taken down you can ask for, and get, a sale price even after the expy. date.
Homework's done, now I can go play...
C