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It's this. https://www.amazon.com/Best-Warner-Bros-Collection-Blu-ray/dp/B009L0LEDW
I got it on sale in 2015 for 89.99. Probably the best $90 bucks I've ever spent. I think I had 5 of the movies in the collection beforehand, but you can't beat $2 per blu ray (assuming I only got 45 new movies) for a bunch of amazing films.
I just bought the Warner Brothers 90th anniversary box set containing 50 of their classic movies: Amazon
It's not super rare, but it is a numbered limited edition. I got it for a steal on ebay :) should actually arrive today!
Other ones are mainly collections I enjoy, I have The Godfather Coppola Restoration box, all the Planet of the Apes movies (old and new) in a set, a Steven Spielberg box set, the Christopher Nolan box set (a regular blu ray set comes with the 4k set, someone was selling the BR alone on ebay), the LotR + Hobbits extended editions, all MCU phases - one box per phase (not released in U.S.), Star Wars The Skywalker Saga blu ray box that wasn't released in the U.S. (only 4k was), Harry Potter Hogwarts Collection, The Indiana Jones Box set, Back to the Future, Shrek, Cloverfield all 3 movies, The Mummy all three movies, etc etc :)
I only collect box sets, not individual Blu Rays. It's a fun hobby, especially when you find good deals on stuff!
For Batman 66 ... i have $52 in MGo Credits ($13 x 4),
i also have a code for the Best of Warner Bros 50 Film Collection (redeems 50 HD movies with one UltraViolet Digital Code, list here http://www.amazon.com/Warner-Collection-UltraViolet-Digital-Blu-ray/dp/B009L0LEDW)
I have the Best of Warner Bros 50 Film Collection UVHD (flixster). Its 50 movies 1 uv code. if you already have some of the movies it will just add the ones you do not have. If you have SD versions of any of these it will upgrade them to HD.
I'd really like to get about 10 movies i dont have for it but make any offer. I'll send first since I never trade here. As long as you long post history i dont mind sending first.
Are you interested in the WB50 movies set?