Looks like it's pretty easy to find, there's 3 copies on sale on eBay right now for pretty cheap.

If you do get / make a copy of the audio, make sure to get a video reference as well - when they made the LD master the director went back and cut in all the TV segments from the original NTSC tapes. So, it will switch from film with 3:2 pulldown to straight 60i NTSC for the TV segments. Assuming the print they used for the BD is the same as the previous German DVD, you'll need to do some editing to the audio or video to get it to sync up correctly.