I usually do the following when I'm either buying or selling a car. I check the following sites for value:
kbb.com
nadaguides.com
edmunds.com
They normally vary quite a bit so I average the three. Once I have that number, I go to some of the larger sites that sell cars like cars.com and see what a comparable car in the area(s) I'm looking in is going for. Sometimes these comps are different from the number I got averaging the three sites but it helps. You can also go to ebaymotors and find completed auctions for what you are looking for to get an idea of what things are actually selling for. Hope this helps. It sounds like a lot of work but doesn't really take too long and can save you a lot of money.
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