Abstract: A customer station for use in an items' purchasing system in a supermarket or other retail store is presented. The customer station has an identification assembly, a control unit, a data presentation unit for presenting to the customer information related to selected items, and a deactivator. The identification assembly is operable to identify a nature of an item of customer's interest, and generate data indicative of information related to the item of interest to be presented to the customer. The control unit has a processing system responsive to the generated data indicative of the information related to the item to generate data indicative of the entire sum to be paid by the customer which is to be presented to the customer. The deactivator is operable to deactivate a security tag attached to the item. The entire customer station or at least the identification assembly and the data presentation unit are incorporated in a unit mountable on a supermarket trolley.