If you like science fiction and fantasy books, check out the Humble Bumble eBook bundle by October 23rd. Pay what you like for six (or eight if you pay as much or more as the current average paid) DRM-free ebooks by both newer and established authors, including Neil Gaiman, Cory Doctorow, Kelly Link, John Scalzi and more. You can also choose how much of your purchase price goes to the authors and/or to charity and/or Humble Bumble’s expenses.
Independent bookstores face increasing financial pressure from the rising use of ebooks. Amazon offers many ebooks at a significant discount. This makes it tempting for frugal readers to buy there, especially if they own a Kindle (which device itself is sold at a loss to entice owners to buy their ebooks from Amazon). But there are other options which support indie bookstores and authors directly.
A number of publishers sell ebooks directly from their sites. since I read a lof of SF, one of which I know is Baen. They also have an awesome FREE library of some of their older titles and 1st titles in a series. MacMillian will also sell your their ebooks.
Check the author’s website, as more are choosing to self-publish and self-distribute. And if you buy directly from the author more of the money actually goes to him/her since they don’t need to split it with a distributor.