Just had alook at ebay:
http://cgi.ebay.com.au/PERTH-MINT-1992-KILO-SILVER-UNC-KOOKABURRA_W0QQitemZ190259839597QQcmdZViewItem?hash=item190259839597&_trkparms=39%3A1%7C66%3A2%7C65%3A1%7C240%3A1318&_trksid=p3286.c0.m14
Kilo bullion coin for A$910 with 18 bids