No, there is no federal price tag law in America. However, according to the National Institute of Standards and Technology, at least 19 states and 2 territories have some sort of unit-pricing laws for retailers.  Under the guidelines, unit prices can be displayed either with a separate Price Tag on the shelf or on the same tag as the package price. In New York, for example, “all consumer commodities shall have conspicuously displayed, at the point of exposure or offering for sale, the total selling price exclusive of tax by means of (a) a stamp, tag or label attached to the item or (b) by a sign at the point of display which indicates the item to which the price refers, provided that this information is plainly visible at the point of display for sale of the items so indicated.”