Abstract: A system and a method for constructing a shopping list for purchasing a collection or basket of goods according to a plurality of weighted parameters, preferably with comparison to both “bricks and mortar” stores and also virtual stores (collectively termed suppliers). Preferably the weighted parameters include the ability to prefer friendlier products, such as products which are organic, environmentally friendly, ethical or a combination thereof. Optionally, the user could determine that certain goods could only be purchased from one or more outlets and/or from a particular type of outlet. Optionally and preferably, the optimization includes determining whether to purchase a larger amount of a product in order to enjoy price savings for that product. According to other preferred embodiments, the user may optionally choose to divide a basket of products between a plurality of suppliers, rather than optimizing the basket at a single supplier.