Used Car Sales Northampton Massachusetts. http://bit.ly/Used-Car-Sales-Northampton-Massachusetts Are you in the market for a used car in Northampton Massachusetts? When you shop for used cars in the Northampton Massachusetts area, you want to be sure you're getting your money's worth. Here at Haddad Pre-Owned we specialize in used car sales and sell them at competitive prices. Haddad Pre-Owned's Used Car Department stocks Used Cars Certified pre-owned and used vehicles.