What are some of the best sites to download audio books?

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I'm looking for sites that have a wide variety of genres, and that have popular titles and authors. I'm also looking for sites that have the best deals (as many books as possible, for as low of a price as possible. Here are some examples of what I'm looking for: Horror, Classics, Stephen King, Mark twain, Sci-Fi & Fantasy, Anne Rice, Lord of the Flies, Kids & Young Adults, Dramatizations, etc. Please provide links. Thank you.