You may have Amazon promotional credit that is expiring today. This is credit earned by buying certain apps or by opting for no-rush shipping for Amazon orders. You can check how much credit you have by clicking the “Check your balance” button on this page. Unfortunately, there’s no way to know how much of your credit is expiring today. If you’re like me and archive all your email, you can search your email for the phrase “credit must be used by January 31, 2016” to know exactly how much is expiring today. If you’re not sure what to buy, you can start by checking out Amazon’s digital music deals page.