How much would it cost for a full tune-up on my caddy? on 1998 Cadillac DeVille

I just bought the car and i want to make sure its in great driving condition.

Asked by for the 1998 Cadillac DeVille
It would cost 120-200 just the parts if you do it yourself
A shop
don't know cuz some shop have different prices
THANK YOU, Action 702.