Abstract: A point of sale device for use with a shopping cart, the shopping cart having a basket for holding products, the basket having a bottom, and an upstanding sidewall extending from said bottom and defining open top. The point of sale device has a product detector for monitoring and validating the products in the basket, a control unit communicating with the product detector, the control unit having a user interface with a display screen, and an information detector communicating with the control unit for detecting product information and sending the product information to the control unit. The control unit communicates with the store's accounting/inventory system and has a calculator which calculates the cost of the products in the basket of the shopping cart using the product information and displays at least the cost of the products on the display screen.