There doesn't seem to be a lot of this era of the series on YouTube. There is footage from the syndicated season, and here's another segment from the USA stint:
As Wesley Hyatt says in his The Encyclopedia of Daytime Television, Bandstand did not leave ABC because of declining ratings. Rather, Dick Clark took the show to syndication after the network insisted on a 30-minute format and was giving it frequent pre-emptions due to college football. I think Clark should have "leaned in" to that and had Keith Jackson co-host during the season. "Whoa, let me tell you about Expose!"