When I was a teenager, I used to devour every edition of these books. I understand they are still being published but my local library doesn't have recent editions.
When ever there is a flea market or book sale and I find the volumes I buy them up. I've collected quite a few. You can buy some from Amazon. I love them.
I haven't thought about them in years, until this thread. I don't think the yearbook is published anymore... (?) They have (had?) a website and a Facebook page, but the last update on the web page is from the 2009-10 season. The most recent Facebook post is from 2014.
The website states:
"We are currently behind schedule on the release of the Best Plays series, but we have books for the 2008–2009, 2009–2010 and 2010–2011 seasons in the editing and production pipeline."
If they're truly gone, that would be a shame. I got so much pleasure from those yearbooks!