The latest Humble Bundle offers ebooks on the cheap. The Humble eBook Bundle 3 offers ebooks "The Happiest Days of Our Lives," by Wil Wheaton; "Tithe: A Modern Faerie Tale," by Holly Black; "Jumper," by Steven Gould; and "Zombies Versus Unicorns - An Anthology," by various artists for whatever price you want. Paying more than the average price will get you "Mogworld," by Ben 'Yahtzee' Croshaw; "Uglies," by Scott Westerfeld; and more to be announced at a later date. Paying more than $15 will get you the "Homeland" audio book written by Cory Doctorow and narrated by Wil Wheaton.
Charities being supported by Humble eBook 3 include SFWA and Worldreader.
Find out more about the latest bundle here.