Discounts and advertised promotions including discount codes and shipping codes are subject to change. Any and all discounts are available for a limited time only. Once discount is removed from site, it cannot be honored. This excludes autoship discounts which are locked in and apply to each recurring autoship order until autoship membership is cancelled by customer. Discounts are subject to change based on changes in shipping services costs. Note: New promotions or discounts cannot be added to a previous order, including recurring orders. In order to apply a new promotion or discount, a new order must be placed.