There's a particular kind of math that makes a Buick Grand National listing worth a second look, and this black 1987 car sitting on eBay out of Plainview, New York triggers it. The seller wants $45,000 — Buy It Now, no auction drama, $500 holds it — for an original, three-owner G-body wearing 79,000 miles. The interesting part isn't the number itself. It's where that number lands once you stack it against what these cars have actually been selli…
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