Each of the websites below has much more functionality than described, but I am listing them based on how I use them to help me find good used cars.
Consumer Reports – Used Car Ratings/List of Best & Worst Used Cars
CARFAX – Vehicle History Reports
Edmunds – Used Car Research and Pricing Guidance
Kelley Blue Book – Used Car Research and Pricing Guidance
AutoTrader – Used Car Search
Craigslist – Used Car Search
AAA – Roadside Assistance
I wish you good luck finding a quality cash car!