Here's how this offer works-
-Shop for eligible items Subscribe & Save items from Amazon
-Choose the Subscribe & Save option and select your delivery frequency (every month to 6 months).
-At check out, you must select or enter your MasterCard card as your method of payment, enter promo code MSTRCRD1 to apply to your order. Both the 10% discount you receive from using your MasterCard card and the 5% Subscribe & Save discount will be reflected in your cart.
-Click Sign me up to get 15% off your first shipment and continue saving 5% off your recurring deliveries (you can cancel deliveries at anytime, even after the first order, no obligations!).
-Code is good for multiple items
Offer valid from September 1, 2012 through October 31, 2012 or while promotional funds are available. The additional 10% savings you receive from using your MasterCard card discount is good only towards your first shipment of new subscriptions of select Subscribe & Save items. Promotional code may be used towards multiple Subscribe & Save purchases.