Amazon unveiled Kindle Matchbook today, a new service that offers affordable ebook versions of some of the physical books you've already purchased from Amazon. If the books qualify, you can get the Kindle versions for between $US0.99 and $US2.99, and future books you buy that qualify will get you the same deal.
You can click here to see if any of your past book purchases qualify for cheap ebook copies. If they do, you can purchase them and have them sent to your Kindle (or your desktop, smartphone or tablet with Amazon's Kindle app installed). Hit the link below to read more and to check if your previous purchases qualify.
Kindle Matchbook [Amazon]