A system for online sales with automatic rebate and coupon redemption provides customers making online purchases to automatically retrieve and redeem all applicable rebates and coupons during an online purchase. Purchase orders from customers are selectively fulfilled and products are shipped to the customers either by the system for online sales with automatic rebate and coupon redemption or by other merchant or manufacturer environments. The system makes purchases from merchants or manufacturers using all applicable coupons and rebates and then sells the products to the customers, passing the savings to them. The system automatically retrieves coupons and rebates for items in a shopping cart during the activity of an online purchase at an electronic mall or an online merchant site and to retrieve manufacturer's and merchant's coupons prior to an online purchasing activity for subsequent submission to an online merchant during a subsequent purchasing activity.