Autotrader has 55 Used GMC Sierra 2500 cars for sale near Wilmington, DE, including a 2011 GMC Sierra 2500 4x4 Crew Cab, a 2013 GMC Sierra 2500 4x4 Crew Cab Denali, and a 2014 GMC Sierra 2500 4x4 Crew Cab Denali ranging in price from $6,995 to $75,000.