For the next few days there’s an ongoing promotion at Amazon where you can get a credit back after spending a certain amount on Kindle ebooks.
The “Spend $30, Get $8 back” offer seems to be the most common but it varies by account, and some may not be eligible for the promotion at all.
For some accounts the offer is a $3 credit, but you only have to spend $10. Others have gotten the option for a $4 credit when spending $15.
This is one of those deals that requires activating before it will take affect. Here’s the link to the promotion page at Amazon with all the details.
There’s also a banner ad on top of the main Kindle eBooks page advertising the deal.
The offer expires on August 12th, and you only have 30 days to spend the ebook credit so spend it quickly.
All Kindle ebooks sold by Amazon are eligible, including ebook gift orders, bulk orders, and pre-orders that are fulfilled during the offer period. In fact this is basically a loophole to get discounts in a roundabout way on ebooks sold by major publishers that Amazon isn’t allowed to put on sale.