Greg, Check out: www.1aautomotive.com The manuals come on cd. pretty complete. I have one for my '72.
72 Buick manuals Make sure you get both the Buick tech manual and the Fisher body manual. Got mine from an old guy that had been in business years ago and wanted to dump all he had. Ken
I scored my 72 service manual from ebay for 20 bucks. It was in A-1 shape! However I believe I was lucky because it took about 5 different shots to get one for less than 50 dollars and they are used. Keep trying and you will probably get lucky as I did. Brian