"A friend of mine sister borrowed a book out of my resource pile titled How to teach with Calvin and Hobbes. She had borrowed it for a few months and I finally asked if she was done with it, etc... I decided to look it up at Amazon to see if I could maybe order another one, so they could keep it (they are Calvin and Hobbes freaks!) I was a little (okay a lot) shocked at how much a replacement cost would be... Needless to say, she found it quickly and I put it under lock and key at my house... Who knew a teacher book could become so expensive and worth so much!!"
http://forums.atozteacherstuff.com/showthread.php?t=63079
