Finds cars using a wide set of parameters on both www.cars.com and www.autotrader.com. zipcode, make and model is mandatory rest is optional. There is a maximum of 100 results, but this value can be lowered for quicker responses.

The REST service returns the first 3 items in a search of PriceGrabber.com. The items returned include the vendor, price, and url of item at the vendors web address.