I didn't look closely at this original post when I first read it, but I thought that there was no way that 80,000 people attended the Subiaco show. Not only would that have meant about 10% of the entire population of the city would have been in the one place, but Perth is one of the most isolated capital cities in the world, so it's not like people would have been traveling from all over to attend. I found a review of it here from the time that gives the much more realistic, but still extremely respectable, figure of 8,000.

I'm not sure what you consider 'good quality', but there are a few great shows, particularly the one in Baltimore only a couple of days later. I'm not sure of the absolute best bootleg for it, but you can check out a nice mix of sources on Youtube here:

Thank you Starship - your site is such a great resource. I was actually going to post here and ask if anyone else was getting glitches trying to get onto the site.

Was it one of the tapes from 'The Song Remains The Same'? There are a number of different versions, but this is one of them: https://www.discogs.com/Led-Zeppelin-The-Soundtrack-From-The-Film-The-Song-Remains-The-Same-Volume-B/release/8131060

My best friend's parents went to the Melbourne show but I haven't gotten too many stories over the years about what it was like, beyond the fact that as a performance, it was life changing, and Plant was absolutely incredible in person. The other thing I've heard from them was the crushing disappointment of seeing TSRTS in a theatre a few years after having seen the band at their peak.