I've been a member of Goodreads, a book reading, reviewing, and sharing site, for about 2 years. I really enjoy the site, mostly because it helps me make a note of books I want to read.
Today I joined a group there that is dedicated to Ebooks for $1 or less, including free. I listed Union of Renegades of course. All the usual categories are present, like Literature, Self Help, Cooking, Thrillers, Science Fiction, Fantasy, Romance, etc.
For people who like to hunt out free or low cost ebooks to sample, follow the link to the group:
Ebooks for $1 or less group