I recently started working on a 69 and figuring out that parts can be hard to find, but I went on ebay and ordered a couple service manuals on CD... They were like $12-15 each instead of $75+ paper originals.
Ebay is the best bet and if you keep checking now and then you'll find a pretty good deal. I prefer the book to CD but the CD is much better than nothing and the best price usually. I just like flippin pages.