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First of all, there are different blue book values. One is for Wholesale ( what a retailer will pay you for your used car/motorcycle ), and one is for what the Retail value is ( what he, or you, would try to actually sell it for ). Why would a dealer accept a trade-in and pay $1,800 for something, and then try to sell it for $1,800 ? Makes no sense! So there is actually two values out there, one you get quoted when you trade in, and one that the seller tries to get. One reason you can sell your vehicle higher than a Trade-in offer, is because a dealer is only offering you WHOLESALE blue-book price, not what it'd sell for on the open market, or retail blue-book. So you have to find out what is which when you find a value. I'm not familiar with NADA pricing, and Kelly does have a Wholesale BB, but the one you see is normally Retail. So that's probably the difference you're seeing.