$42
Never even opened. Lower than bookstore price by 10$:
http://www.bkstr.com/webapp/wcs/stores/servlet/CourseMaterialsResultsView?catalogId=10001&categoryId=9604&storeId=10161&langId=-1&programId=562&termId=100024991&divisionDisplayName=Stanford&departmentDisplayName=PHYSIC&courseDisplayName=45§ionDisplayName=01&demoKey=d&purpose=browse
Please do not message this poster about other commercial services.
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