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a professor of mine wrote his own textbook.. and instead of making us buy it at the bookstore for $100.. he put it on the school's website, let us download it and print it. sure it costs money for printing paper (say $5 a ream) and for printing ink ($20 depending on what kind you have) but it beats spending $100.
and with a ream of paper and cartridge of ink you can split the cost between friends and it won't cost you more than $5!
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