Used Car Rates

Halifax Nova Scotia area here. Is there any insight as to whom has the best "certified pre-owned" used car rates? My old junker is dying a slow, methodical death. I think I may bite the bullet and get a newish pre-owned car instead of another shitbox. I'm thinking Civic-Mazda3-Elantra-Corolla sized. Excellent credit (830 plus), not in a giant hurry but the repair bills are nickel and diming me, and wrenching on it is killing my free tjme