Humble Bundle offers downloads of its Humble eBook Bundle for whatever you want to pay. If you opt to pay the bare minimum of 1 cent, that's easily the lowest price we could find for this 6-book bundle. (The Kindle Edition of Pirate Cinema costs $9.99 alone.) If you choose to pay at least $10.22 $11.58, you'll get two extra books: Signal to Noise and Old Man's War. The bundle otherwise includes Pirate Cinema, Pump Six and Other Stories, Zoo City, Invasion: The Secret World Chronicle, Stranger Things Happen, and Magic for Beginners. It's available in multiple formats, including PDF, MOBI, and ePub. Your contribution can be donated to charity (Child's Play, Science Fiction and Fantasy Writers of America, or the Electronic Frontier Foundation), the authors, or both. Deal ends October 23 at 7 pm ET.

Update: The minimum price needed to unlock the additional books changes depending on the average price paid for the bundle. It's likely to fluctuate several times over the course of the offer period