A computer-implemented method for interactive shopping by a customer includes providing a downloadable user interface readable on a mobile electronic device that receives shopping list data representing items in a shopping list associated with the customer and receives coupon data representing coupons held by the customer for one or more of the items in an inventory of items for sale at a retail store. The shopping list includes items selected by the customer from the inventory of items. The method may further include receiving a request to checkout from the customer and, in response thereto, consummating a sale of the items in an electronic shopping cart by discounting a price of each item in the electronic shopping cart for which the customer holds coupons by an amount corresponding to the respective coupons.