So apparently there's a deal on some Superman Kindle comics today. http://www.amazon.com/b/?_encoding=UTF8&camp=1789&creative=390957&linkCode=ur2&node=9563432011&tag=kotakuamzn-20&ascsubtag=[referrer|io9.com[type|link[postId|1502645370[authorId|5856732741879800112
A dollar each for the Geoff Johns run, it seems like. If you find more, feel free to post about them. I just remember Johns being pretty good from The Flash.