An online sales/automatic rebate and coupon redemption system provides online customers automatic retrieval and redemption of all applicable rebates and coupons during 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 purchases from merchants using applicable coupons and rebates and then sells the products to the customers, passing the savings to them. The system makes it possible to automatically retrieve 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. The system provides coupons to potential customers via email, based on customer profile, geographical information, etc. Manufacturers and merchants can update coupon value and content based on ongoing sales and volume of customer activity.