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I did my whole college recently and only bought one small pocket refernce from the book store (mainly because I wanted the book for future ref)
The rest I borrowed one or two from friends who had taken the class already, used one from the library (well the few they had), or bought used editions on e-bay. I found that an old edition was not an issue since all they had changed from one year to the next was page numbers.
It was great getting my books for $2.67 etc. on ebay.
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