Dan, the BSO recorded the Mahler 5th with both Leinsdorf and Ozawa, but apparently neither one is currently available, at least from the usual sources. I can recommend the recording by von Karajan and the Berlin Philharmonic, now on sale at Tower . If you'd care to order I can make further suggestions to put you over the $20 for free shipping(way over if you want).

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Enjoy the music, not the equipment.