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Kelley Blue Book
Blue Book retail & trade-in value reports on used vehicles. Kelley features prices on used cars, trucks, street and dirt bikes, ATVs, scooters, mopeds and sidecars, personal watercraft and snowmobiles. Free new car pricing reports with specs, photos, invoice and MSRP.
N.A.D.A. Appraisal Guides
America's Leading Source for Used Vehicle Values
National Highway Traffic Safety Administration
You pay for it with taxes, might as well us it. :-)