Here's this week's roundup of auto dealership buys and sells from around the U.S.: Four dealerships changed hands in the third quarter in four deals that involved luxury- and domestic-brand stores. Here's a quick look at the deals. Two transactions involved groups ranked on Automotive News' top 150 dealership groups listing. LaFontaine Automotive Group, one of the largest privately held dealership groups in the country, has purchased a Michigan Buick-GMC dealership group that last year sued General Motors and GM Financial over allegations of unfair termination of floorplan agreements and racial discrimination.