Welcome to the joys of sourcing parts and equipment across borders! It can be a pain in the butt just getting stuff across the Canadian border, let alone halfway around the world!
If you've checked for local radio control hobby shops, and on the Aussie version of ebay (take a look for servo cable... it seems there are some online shops that ship from Brisbane from my quick glance) and can't find a decent price, then you might want to try making your own, as others have suggested. Not only do you get them EXACTLY the length you want (okay... usually about one centimeter shorter than you want, if you make them the way our team does....) but they also come in a lot cheaper.
You may also want to contact a local radio control flying club where, of course, they know them as servo cables, rather than PWM cables.
Welcome to FIRST!
Jason
Edit: Couldn't go without suggesting a Canadian source:
http://www.robotshop.ca/cables-wires...en.html?p=2-20