I have Principles of Microeconomics Sixth Edition by N. Gregory Mankiw in addition to the Study guide that goes with it. Both are in a secondhand condition nevertheless neither have been written in or have any notes in them. The study guide was really helpful for the class however I simply made copies of the pages instead of composing in it.
ISBN 13: 978-0-4-2.
ISBN 10: 0-4-4.