A ZR-1 went for 22 thou this weekend, it has 74k miles though... and a GN went for 16 thou

http://www.barrett-jackson.com/Events/Event/Details/1994-CHEVROLET-CORVETTE-ZR1-181449

http://www.barrett-jackson.com/Events/Event/Details/1986-BUICK-GRAND-NATIONAL-2-DOOR-HARDTOP-181070