Negotiable like anything else. See Edmunds; they show Private Party, Dealer, and Certified Pre-Owned average prices for your zip code. The CPO price will be highest because of the extensive inspection program and selection criteria for eligible trade-ins. NOTE: Some dealers have their own “certification” program. This is not the manufacturer’s program. Buyer beware.
Opinion - go with a Minivan if fixing your current vehicle is out. I agree with above opinions that repair/refurbish is the way to go. My last new vehicle purchased was a Honda Civic back in 1989 - my ex still drives it past 275,000 miles.