Abstract: A supermarket with a central computer (I) and a plurality of check-outs (K) each having a bar-code reader (L) and a register (M) connected to the computer (I) for retrieving computer stored sales data pertinent to source-coded saleable products bearing a bar-code label, also comprises a service counter (C) for sales of `fresh` products whereat a dispenser (D) is provided for issuing bar-code labels having a unique number pre-printed thereon in bar-code form, counter (C) also comprises means (G) connected to computer (I) for determining sales data for each such fresh product (H), reader (F) for identifying the unique number of the pre-printed bar-code label affixed to product (H), reader (F) being connected to computer (I) to thereby address a computer memory location for storage of the fresh product sales data identified by said determining means (G), said fresh product sales data being retrieved from the computer memory location by subsequent operation of the check-out bar-code reader (F) by the pertaining p