$3 towards this selection of Kindle books [amazon.com]
Only the Kindle books below are eligible for this promotion – you can use your $3 credit to purchase any of the Kindle books below. To purchase a Kindle book, click on it, then click the "Buy now with 1-Click" button. Please note that the price shown will not change, but your credit will be applied to your purchase automatically, reducing the purchase price of each Kindle book by $3 (the credit will appear after the order processes). Complete your order before this promotion expires at 11:59 p.m. (PST) on the last day of the month.