Not all Amazon products have coupon codes that can be applied at checkout. Amazon lists its current checkout codes in its coupon section, where it divides available coupons by product category. It also lists the most popular active checkout codes.
Amazon does not guarantee that any discounts or promotions will work, and reserves the right to change or discontinue all checkout codes at any time. Some codes are limited to one use per customer or account, and most cannot be combined with other coupons or offers.
If multiple items in a transaction are discounted by a coupon, all discounted items must be sent to the same address. Amazon reserves the right to charge shipping on items discounted by checkout codes, including items that are free as a result of the coupon.