http://www.fandango.com/cinemarkmovies10_aainq/theaterpage - scroll down to "Tickets Now Available for these Coming Attractions", keep on scrolling and there are the Met operas. If you want to see, say, Les Contes d'Hoffmann, click on the date Saturday, December 19, 2009 or Wednesday, January 6, 2010, then on the next screen click the time of the performance (6.30) and hey presto, you can buy tickets online.