Amazon just started running a new promotion that gives you $10 in free Amazon credit when you spend $45 or more on Amazon gift cards. The promotion is only available to Amazon Prime members, but those with a free 30 day Prime trial also qualify. Your best option is a 3 pack of $15 cards. Simply add the gift cards to your cart and enter the code HOLIDAYGCS at checkout to get your free $10. Note that if you’ve purchased Amazon gift cards in the past, you do not qualify for this promotion, but you can always start a 30 day Prime trial on a new account if you don’t want to miss out on this deal. The promotion ends November 15th and you will receive your $10 credit, which must be spent by January 1st, within 2 days after placing your order.