I sometimes buy used cars with no owner's manual.
Bought a manual on eBay for my '97 Lumina.
Cost 10-15 bucks with shipping, don't remember exactly.
You can free download pdf Chevy owners's manuals here.
Some Buicks here.
Looking for pdf downloads often leads you to websites that mislead
with all the usual tricks, and charge for what you can get free from
So if a pdf manual is good enough, look around before you pay.
My Lumina manual got soaked when my basement flooded.
No idea why it was in the basement.
I do know why my basement flooded.
That's what led me to find these sites.
Don't know if these websites existed when I bought the manual from
eBay about 6 years ago, or if they'll be around next week.