$10,016 off MSRP! Onyx Black 2026 GMC Sierra 3500HD Denali Ultimate 4WD 10-Speed Automatic Duramax 6.6L V8 TurbodieselLocated at 5901 S Pennsylvania Ave, Lansing, MI, LaFontaine Buick GMC Lansing is easily accessible and open six days a week to serve you better. Whether you're looking for a new vehicle, need service, or want to explore financing options, our friendly staff is here to assist you.New vehicle pricing includes all offers and incentives. Tax, Title and Tags not included in vehicle prices shown and must be paid by the purchaser. While great effort is made to ensure the accuracy of the information on this site, errors do occur so please verify information with a customer service rep. This is easily done by calling us at (517) 507-4955 or by visiting us at the dealership. Lafontaine Family Deal Price is GM Employee Price Less any applicable rebates. Must qualify for GM Employee pricing. Not everyone will Qualify.