Does anyone know why the Volume 2 & 3 of this 6 volume set are so expensive? You can get Volumes 1,4,5, & 6 for about $20 ea, but the cheapest (even used) for Volume 3 was about $40, and $188 (!!!) for Volume 2. I was wondering what was so special about the second volume that made it so rare/expensive. Thanks and if this thread has been started before, I apologize. I did a search and came up empty.