From December 24 to December 28, Amazon will give you a $5 Amazon credit when you download an Android app from the Appstore.
This credit applies to apps (free or paid) downloaded through the Amazon Appstore for Android app. If you need help getting Appstore, check this out. This offer is not available for apps purchased on a Kindle Fire tablet.
The credit’s applied almost instantaneously to your Amazon account.
Perhaps a little more Amazon shopping? Maybe an after-Christmas gift?