With two nights to go to the start of the COC’s season the discounting has started already.  The deal is buy tickets for any two other operas and get free tickets for La Bohème.  The deal is good for performances on October 16, 25, 27, 29 and 30 and appears to apply for all but the cheapest and most expensive seats.  The website isn’t exactly splashing the news around.  You will only see the offer if you try to buy tickets for La Bohème or if you just happen to be poking around to see how well things are selling.