Visit Lou Sobh, the largest GM dealer in the southwest. Lou Sobh is your area Atlanta GMC dealer, the GM Giant, serving Roswell and Atlanta, GA, for a wide selection of new and used Buick and GMC cars, trucks and SUVs in Duluth. Don’t miss out on specials and incentives, including the new Buick Enclave, GMC Sierra, or view pre-owned vehicles online. Get a quick quote and research financing options. As your area Atlanta Buick dealer, we’ll help you find the perfect vehicle that suits your needs.