I buy most from Kobo, simply because they are the easiest for me to liberate, and their prices are usually equal to Amazon. I bought by first book from B&N just a few days ago (for the B&N app) and the DRM came off easy.... If you got Python and such installed, there are some scripts now that are pretty painless....
I have never bought a song or book from Apple, the books are to expensive, and the DRM is too heavy anyway..... Music, I like Amazon MP3's.......
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