Welcome to Haggerty Buick - GMC As your Illinois Buick - GMC dealer, we are committed to making your on-line Buick - GMC sales experience a truly rewarding one. As always, our primary goal is customer satisfaction. Should that be helping you select the perfect color for your new, pre-owned or certified Buick - GMC, helping you choose just the right auto financing option or setting up a service appointment to change your car's oil - we'll be there for you. Now that you've visited our Buick - GMC dealer web site, we invite you to stop by our showroom to see our dedication and commitment firsthand. Please contact us immediately at Haggerty Buick - GMC, a Illinois Buick - GMC Automobile Dealer.