questionsdoes anyone know a legal cheap source for…

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If you're willing to download them from the internet, there are tons of options.
librivox.com, booksshouldbefree.com and podiobooks.com are the three that first come to my mind. Podiobooks allows you to download books as podcasts. They have a pretty wide selection. Librivox and booksshouldbefree are mostly (all?) books in the public domain.

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Also, Project Gutenberg has 38,000 free books, in various formats.
http://www.gutenberg.org/wiki/Main_Page

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Please ignore my previous comment. I was thinking of ebooks.

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As an add on I am looking for more current titles. Rather than ones that have become free-domain

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I get my audiobooks from the library, free everytime and they will even order them for me if they don't have what I want. I have a 45 minute drive each way to work, if it weren't for audiobooks, I'd go nuts, lol.

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Amazon has quite a few free month long book rentals if you have a Prime Membership account. Just throwing it out there. Haven't used it myself, so I don't know if this works only with kindle products, or if you can download the books straight to your computer.

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You could also check out this community driven option for audibooks. The project is indiegogo.com/audiobooklibrary