I believe that these are printed yearly, if not twice a year.
They seem to be VERY rare finds on eBay of late - twenty or so years ago there were many of them on eBay.
They will be divisional specific - I am not sure what the proper search terms would be for any Acadian ect models.
I recently found a pair of 1972 Pontiac (USA) books - I love literature like this;
Maybe you can find a dealer book too - those are the best.
Odds are good that literature collectors have them all these days - I believe that a recent thread here cited a Canadian literature collector - it might be a worth while task to email him.
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1970 Formula 400 Carousel Red on black (std) interior "no drivetrain option" car (same base drivetrain as GTO) 1:411 1970 Firebird Formulas originally sold in Canada