Shutterfly has a handy (and smart for being extra user-friendly) feature, which lets you enter any promo code (1st/2nd/3rd-party) at any time and then keeps them ALL tied to your account under My special offers and discounts. Then - as you add / remove items to / from your cart - the Shutterfly checkout system actually appears to dynamically pick combinations of the promos that have piled up in your account in such a way as to optimize your savings. (Wish other online sellers did the same!)
Shutterfly - permalink to first-party promos
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