http://www.everlastingbouquets.com.au/index.html A closer place than werribee. I'm not sure if they're actually open though as I had trouble contacting them when I was looking for somewhere.
Fiona R. replied:
http://m.wikihow.com/Preserve-Wedding-Flowers Another idea?
Fiona R. replied:
This is where I got mine done just in case you want it :) http://www.bouquetsforever.com.au/