I'm not aware of any dealers that have online stores, and most dealers seem to order in parts as required from Suzuki Australia. That would usually be a fairly quick affair in a major city like Melbourne- possibly even overnight?
You'd be looking at the kit to suit either an XL (2010-2011) or Touring (2011-13) model - they're the models here with the non RF head units standard. I can help out with plug comparisons for an Aussie 2011 Kizashi Touring head unit as I've got a spare lying around gathering dust.

The bluetooth kit part number for the Touring is 990AA-01210-57L