Update: This deal appears to be expired for new registrations.
If you have an American Express card, log into your account online and scroll down until you see the “Offers For You” tab. Many (but not all) will find a Amazon.com offer where you if you spend $75 on your linked AmEx, you’ll get $25 back. (Looks like this, but for Amazon). Again, the easiest thing to buy may be an Amazon electronic gift certificate that way you don’t need to spend that $75 now and you can combine multiple gift codes.
Get a one-time $25 statement credit by using your enrolled Card to spend a total of $75 or more online at Amazon.com by 12/31/2013.
However, this offer does not appear to be targeted, and should be available to everyone with an eligible card. You can also sign up via American Express Sync partners Twitter and Facebook, but the easiest way to apply appears to be at this special offer link. It also looks like authorized user cards can apply for their own separate $25 credit using that last link. Thanks to reader Linda for the tip.
These AmEx offers that are valid on every card can really add up. I’ve already mentioned that the only annual fee card I renew every year is the Starwood Preferred Guest® Credit Card from American Express which has an annual fee of $65 (first year is free). We use Amazon Mom for our baby needs so with the free authorized user card, that is $25 x 2 here plus $10 x 2 for Small Business Saturday so that is $70 already, not including the previous Lowe’s and Staples offers where I could buy gift certificates to Amazon, etc. as well.