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I thought this was pretty interesting, a friend of mine recently went back to school to study sociology (though I don't know why). Anyway, she has an ipad and her university has began to offer some textbooks in e-format for ipads and tablets. She said the e-books ran about $20-$25 each compared to the physical books that ran from $50-$75. Also, she doesn't have to lug around heavy books in a backpack which is a plus.