Hi, Rev Reynolds-
bookfinder.com (click) has lots of books from the Music for Living series, but not many teacher's guides. I believe the Teacher's Guides were spiral bound and softcover, which may be why not many have survived. This link will lead to Teacher's guide 1, 2, 5, and 6. If you search for the individual book title and add the word teacher's, you may come up with the missing Teacher's Guides - like this (click).

-Joe (e-mail sent)-