while the Aussie dollar is up.. you could look at buying through a dealer in the States such as Chicago Harley. Some big savings to be made if you can get it shipped cheap.
I got my SE tuner from eBay for $290 and air cleaner from US too
cgi.ebay.com/ebaymotors/HARLEY-DAVIDSON-SCREAMIN-EAGLE-SUPER-TUNER-32109-08B-_W0QQcmdZViewItemQQhashZitem3360f6c14aQQitemZ220670116170QQptZMotorcyclesQ5fPartsQ5fAccessories