http://www.carsdirect.com
2. AutoTrader.com
http://www.autotrader.com
3. CarPoint
http://www.msn.com
4. NADA Guides
http://www.nadaguides.com
5. CarPrices.com
http://www.carprices.com
6. UsedCars.com
http://www.usedcars.com
7. AutoNation.com
http://www.autonation.com
8. CarSmart
http://www.carsmart.com
9. autobytel.com
http://www.autobytel.com
10. Autogiant
http://www.autogiant.com