Another app that uses the cart method is http://www.shopgeniusapp.com/ http://www.shopgeniusapp.com/ The reason the cart method is powerful is because shipping

Another app that uses the cart method is http://www.shopgeniusapp.com/ http://www.shopgeniusapp.com/ The reason the cart method is powerful is because shipping can be compared (FS on $X+) as well as promo codes or other cart-based deals.