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I haven't got my books for this semester yet (class starts next week) but I always plan for around $120-$150 per class. I rely upon books, simply because I'm not a fan of attending class so I need to get my info somewhere.
As for new editions, its really a pain but many professors will let you know if an older edition will do. Also, I remember reading in USA Today awhile back that one of the reasons for the cut-and-paste new editions is because most companies don't make any money on the initial edition, and rely upon later editions runs for profit.
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