I doubt there were many "good" if any houses in in Sydney under...

I doubt there were many "good" if any houses in in Sydney under 100k in 1999. Units or studios maybe but my knowledge of the outer suburbs is limited.

I do recall a friend looking at buying an old fibro house in reasonable condition back in 2000. Decent size block with dual occupancy potential. The suburb was Cambridge Park near Penrith and the price was $145000, 48km from the CBD.

I also recall being at an auction in 1999 12km from the CBD south of sydney, dilapidated federation house on 500sqm in need of full restoration or demolition and went for $384k.
Everyone at the auction couldn't believe the price including myself. That same house would fetch minimum $1.3m, in saying that i believe they paid a bit too much in 1999.