I'm sure someone local in Melbourne can suggest where to find some Pan F+, it's still available locally for me in 135 and 120, and I'm in Adelaide...I'm pretty sure I saw some at Vanbar when I was there too, if somewhat overpriced. Your main hurdle is salesmen who insist Ilford went out of business years ago.
But as far as black and white film under 100ISO, it's the easiest to find these days. Neither Kodak or Fuji make an equivilent, but there's some good stuff from Europe. I'm quite fond of Adox/Efke 25, but I order it from America.