The Kindle Matchbook Program, which allows you to get free or cheap ebook versions of physical books you purchase through Amazon, ends on October 31st. If you’ve bought any Mage Errant paperbacks, they’re all enrolled in the Kindle Matchbook program!
You can check here to see if you have any Kindle Matchbook eligible titles until the end of the month! (I had four that I hadn’t taken advantage of- Dostoevsky’s Notes from Underground, Dan Simmons’ Illium and Olympos, and Neil Gaiman’s American Gods.)