I have a final print, 22P manual for sale (Effective Nov 1990). It is in very good condition. This copy is originally from Canada, but has served me well looking up part numbers on GMPartsDirect.com, and would seem interchangeable. The diagrams were nice to have too.
I would be looking to get $50 plus shipping. Domestic shipping should be around $13.60 (USPS flat rate med box). (To Canada would be way more, looks like at least $45... but local pickup in the Buffalo area is a possibility too).