Several online and print sources, including NADA Guides and Hagerty, offer valuation tools and listings you can use to help determine the value of a classic car. Check with eBay Motors, your local Craigslist listings and online car enthusiast clubs for further information on what a given make and model may be worth in your area.
Selling a classic or exotic car can be difficult, as the real value is dependent on condition, mileage, rarity and the current selling climate in a given local market. NADA Guides lists price ranges for many classic cars via a searchable database on its website, but you may need to pay to use some features. Many buyers use the current NADA Guides price for classics as a good jumping off point, much as Kelley Blue Book often helps owners of newer vehicles set pricing when it's time to sell.
At Hagerty, a classic car valuation tool allows users to search by VIN or by year, make, model and mileage to find a range of what similar cars sold for in recent times.
OldRide.com lists hundreds of online auto enthusiast clubs located on the Web, any of which can be a good source for pricing information via posting questions on newsgroups and message boards. Some clubs even operate dedicated message boards where owners of vehicles can list their cars for sale to other enthusiasts.