For its Prime members who are new Amazon gift card customers only, Amazon offers a $10 Amazon Credit for free with the purchase of $45 or more in select Amazon Gift Cards via coupon code HOLIDAYGCS. That's the best promotional credit we've seen from Amazon for these gift cards. (We saw a $10 credit with a $50 minimum in July for Amazon students.) Deal ends November 15.

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Of note, a promotional code for the credit will be emailed to you two days after purchase and is valid through January 1, 2015. There's a limit of one promo code per customer.