We moved from the States to New Zealand and brought our Litter Robot with us. Using a voltage converter and mains plug adapter it worked brilliantly. I've listed what we used below.
We're back in the States now but let us know if we can help (PM or e-mail). I think you're biggest expense (besides the LR) will be shipping and then you have to deal with GST and import duty. I'd guess shipping from the States would be about US$150 or so.
Here's what we used to convert the 110v to 230v:
VX 69 - Multi-Purpose AC to DC Converter - 500mA - Multiple Outputs & Dual Voltage
» Multiple output plugs
» Converts 110V or 220V to multiple DC output (1.5, 3, 4.5, 6, 7.5, 9 and 12 Volts)
» Easy setup
Price : US $ 6.99
It can be found at this website:http://www.voltage-converter-transformers.com/light-duty-voltage-converter.html
You could probably find the same thing at Dick Smith though.
Best of luck!