Preferably free on YouTube.
Tommy. (Rock Opera) link
Billy Budd by Benjamin Britten.
The Death of Klinghoffer by John Adams
Prokofiev – The Love For Three Oranges – Opera North
Nixon in China
Porgy and Bess
One my favorites. Maybe not true opera but OH ya !
Do a YouTube search for Gilbert and Sullivan. HMS Pinafore for example
Amahl and the Night Visitor
http://www.imdb.com/title/tt0073629/