Interested in your outcome. They seem to be the only supplier of the Lantronix Xport in Australia.
Looking at their "Arduino Mini USB Adapter" they have this note:
We're experiencing extremely high demand for the Arduino line, order now to secure your Arduino for shortly after easter!
although it doesn't appear on the decimila page. Sounds like they don't keep much in stock in Australia, which is fair enough, it's not a massive market.
They seem to have a bit of a markup on the products, but still they end up being cheaper than shipping stuff from the US. For example the motor shield PCB is $AU18+GST, compared with the US$5 it's going for on the NCK and adafruit shops. Although their new "reduced" price for the Decemila is pretty competitive.