leanpub, 
Leanpub might be the only self-publishing site that lets people choose how much they want to pay for an ebook, based both on how much they can afford, and how much the author earns http://help.leanpub.com/en/articles/110750-why-do-i-see-a-suggested-price-and-a-minimum-price-when-i-buy-a-leanpub-book-what-is-variable-pricing It's a great way to support independent authors! #books #selfpublishing
