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Your story about the calculator and your trig class reminds me of the used book sale at the end of every semester. So many were "like new" and "barely used", it is a wonder the sellers passed their classes!!!

All my text books are in "like new" condition. Not because I didn't use them*, but a) I'm not a highlighter/underliner, and b) given that those things cost $100+, you bet your butt I'm going to take care of them. Fortunately, I went through a faculty where the profs wrote most of the required "books", and they only cost about $25. Most semesters, my cost for books was under $300.

* not to imply that I was a stellar student, however.