I'm not sure how long this offer will last (and right now it only works in the USA), but you can download Brandon Sanderson's Steelheart for only 4.99$ here.
Here's the blurb:
There are no heroes. Every single person who manifested powers—we call them Epics—turned out to be evil.
Here, in the city once known as Chicago, an extraordinarily powerful Epic declared himself Emperor. Steelheart has the strength of ten men and can control the elements. It is said no bullet can harm him, no sword can split his skin, no explosion can burn him. He is invincible. It has been ten years. We live our lives as best we can. Nobody fights back . . . nobody but the Reckoners. A shadowy group of ordinary humans who spend their lives studying powerful Epics, finding their weaknesses, then assassinating them. My name is David Charleston. I’m not one of the Reckoners, but I intend to join them. I have something they need. Something precious, something incredible. Not an object, but an experience. I know his secret. I’ve seen Steelheart bleed.