BPC § 12024.2 – Business and Professions Code
(a) It is unlawful for any person, at the time of sale of a commodity, to do any of the following:
(1) Charge an amount greater than the price, or to compute an amount greater than a true extension of a price per unit, that is then advertised, posted, marked, displayed, or quoted for that commodity.
(2) Charge an amount greater than the lowest price posted on the commodity itself or on a shelf tag that corresponds to the commodity, notwithstanding any limitation of the time period for which the posted price is in effect.
(b) A violation of this section is a misdemeanor punishable by a fine of not less than twenty-five dollars ($25) nor more than one thousand dollars ($1,000), by imprisonment in the county jail for a period not exceeding one year, or by both, if the violation is willful or grossly negligent, or when the overcharge is more than one dollar ($1).
(c) A violation of this section is an infraction punishable by a fine of not more than one hundred dollars ($100) when the overcharge is one dollar ($1) or less.
(d) As used in subdivisions (b) and (c), “overcharge” means the amount by which the charge for a commodity exceeds a price that is advertised, posted, marked, displayed, or quoted to that consumer for that commodity at the time of sale.
(e) Except as provided in subdivision (f), for purposes of this section, when more than one price for the same commodity is advertised, posted, marked, displayed, or quoted, the person offering the commodity for sale shall charge the lowest of those prices.
(f) Pricing may be subject to a condition of sale, such as membership in a retailer-sponsored club, the purchase of a minimum quantity, or the purchase of multiples of the same item, provided that the condition is conspicuously posted in the same location as the price.