A great resource for teaching visual rhetoric is Duke University’s AdViews.
AdViews is a digital archive of thousands of vintage television commercials dating from the 1950s to the 1980s. These commercials were created or collected by the ad agency Benton & Bowles or its successor, D’Arcy Masius Benton & Bowles (DMB&B). Founded in 1929, Benton & Bowles was a New York advertising agency that merged with D’Arcy Masius McManus in 1985 to form DMB&B. Major clients included are Procter & Gamble, Kraft, Schick, Vicks, and Post, among others.