Cal. Health & Safety Code § 110365

The department may regulate the placement upon any package that contains any food, drug, device, or cosmetic or upon any label affixed to the article, of any printed matter stating or representing by implication that the article is offered for retail sale at a price lower than the ordinary and customary retail sale price or that a retail sale price advantage is accorded to any purchaser of the article by reason of the size of that package or the quantity of its contents.