You can find us online at br br br 2019 Buick Cascada br br br The premier Buick dealership in the Marietta OH area is without a doubt Pioneer Buick GMC! Take one step on the lot of Pioneer Buick GMC, near Marietta OH, and you will quickly see why we are the premier. Pioneer Buick GMC has the premier Buick inventory, from pre-owned to new. Pioneer Buick GMC has the premier Buick service department. Pioneer Buick GMC has the premier Buick parts department.