Oodle - Oodle is a web-based market of the millions of advertisement and classifieds.
Cars.com - Visited by more than 11 million car shoppers each month, Cars.
craigslist - craigslist provides local classifieds and forums for jobs, housing, for sale, services, local community, and events
TrueCar - Buying a car can be painful.
Geebo - Geebo is an online classified ad provider of employment, real estate, vehicles, local artists, house for sale, apartments for sale, and likewise many other types of advertisement for free.
IAAI - IAA Buyer Salvage Auctions app allows you to find your favorite car by browsing an extensive collection or by looking for it in specific auction lists.