I just ordered that part from the US 800 number (800-863-5394 ) for about $44. I beleive this took me to customer service in Australia, the parts distribution for the US is in California. They only take part orders over the phone - no web. Not sure your model - but here is a PDF of the parts for some common models:
http://www.stokes-aus.com.au/StokesAP/Manufacturer_Info/FP/DISHWASHERS/599084%20Dishdrawer-Version%203%20%20eg%20%20DD603%20etc.pdf
DC
January 2009