United Grocery Outlet would like to celebrate with you and the Warren County community. UGO is celebrating four decades of serving customers with a customer appreciation day set for this Saturday, Nov. 1, at its location on New Smithville Highway.United Grocery Outlet is the largest close-out grocery company in the Southeast and is family owned and operated. The company began in the small East Tennessee town of Etowah and was known as Bargain Barn.