2025 GMC Sierra 3500 Price: $75,605 756 Smithtown Bypass, Smithtown, NY 11787 More Smithtown, NY GMC Sierra 3500's 2025 $104,960 Miles 2025 $83,480 Miles 2025 $103,810 Miles 2024 $87,995 521 Miles 2025 $100,110 Miles 2025 $99,365 Miles