There is a company all over Aussie called Jaycar Electronics
And here's the website:
http://www.jaycar.com.au/Re the GSM phone issue, are both 900 and 1800 used in Aussie, or just 900MHz?
"Tri-band" often confuses people, since it can mean different things in different places.
Tri-band phones sold in the U.K. are usually 900/1800 (the British/European bands) plus 1900 for the Americas.
Tri-band phones sold in the U.S. will normally be 850/1900 for North America plus 900 for Europe.
