The most expensive item in my music collection is a 16-LP set of Mahler symphonies, conducted by Lenny:
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Happy Birthday, Leonard Bernstein! A musical titan of the 20th century as a composer, conductor and communicator, Bernstein was unquestionably one of the most on Deutsche Grammophon. Listen and buy now.
www.deutschegrammophon.com
It's a limited edition of 2600 sets. I've got #2357. I could've had #37 for another $100, but decided a lower number isn't worth that much money unless you're getting down to a single-digit number.
Currently on my 2nd play-through of this set. Now listening to Symphony No. 2.