Not sure what it is going for, but there aren't too many around. There were 60 growlers sold in 2013. Not positive of the number sold this year, but may have been closer to 100. I suggest you aim for a growler and NOT one of the 750ml bottles from 2012, as those are prone to infection (only year Town Hall ever bottled...no infection issues with the growlers). That said, it is probably more a function of finding one of the few people who have a growler rather than assuming you need to throw crazy whales out to get it. Pretty tasty, so hope you are able to track one down!
And if I misunderstood your post and you are holding the Buffalo Bock, then.... talk to @RyanMcFly1985