receiving a purchase request for an item from a customer including receiving a purchase request in an electronic commerce server through an electronic data communications medium, wherein the purchase request includes an item identifier:

determining, using a computer, a weight of the item including selecting an item record in dependence upon the item identifier, wherein the item record includes data elements describing the item, including the weight of the item, and reading the weight of the item from the item record;

identifying, using a computer in dependence upon the weight of the item, a shipping weight range and a shipping cost for the item, wherein the shipping weight range includes a maximum shipping weight;

calculating, using a computer, a difference between the weight of the item and the maximum shipping weight in the shipping weight range;

selecting, using a computer an upsell item in dependence upon the difference between the weight of the item and the maximum shipping weight in the shipping weight range including selecting an upsell item having a weight not greater than the difference between the weight of the item and the maximum shipping weight in the shipping weight range, a type code matching a type code associated with the item, at least one demographic code matching at least one demographic code associated with the customer, and an item type matching an item type associated with the customer through a purchase history; and

offering, using a computer, the upsell item to the customer, including offering to ship both the item and the upsell item for only the identified shipping cost including offering the upsell item to the customer from the electronic commerce server through the electronic data communications medium.