A shopping receptacle for receiving and retaining a product item having an interface surface associated therewith, the interface surface having disposed thereon or therein coded data including a plurality of coded data portions, each coded data portion being indicative of an identity of the product item, wherein the receptacle comprises: (a) a receptacle body adapted to receive and retain the product item and having an opening through which the product item may be placed within the receptacle body; (b) a sensing device adapted to sense at least some of the coded data on the interface surface of the product item as the product item is placed within the receptacle body, and generate indicating data indicative of the identity of the product item; and, (c) a weighing device for sensing the weight of the product item, and generating weight data indicative of the sensed weight, the weight data and the product item identity being provided to a computer system which: (i) determines, using the indicating data, an indicated weight of the product item in accordance with weight indications stored in a data store; (ii) compares the indicated weight to the sensed weight; and, (iii) is responsive to the comparison.