1987 Buick Grand National Coupe Call for price Selling At Auction - Scottsdale - March - 2021 - ; This limited-edition GNX is #22 of 547 Buick Grand Nationals. This original example is powered by a 3.8-liter 6-cylinder engine backed by a... Barrett-Jackson Auction Company Scottsdale, AZ 6 mi (888)-444-3002 Inquire