Samsung Galaxy S4 i9500 (16GB, White) shipped for $719.97 from Duty Free Central
However, the best price I could find was from Duty Free Central where you can get the same model in white delivered to your front door for just $719.97.
I haven't used Duty Free Central myself though and therefore am unsure of their reliability. Spent a minute looking at a few reviews and while most people are happy with the fact that the pricing is good and receiving their orders is fine, the company's reputation when it comes to dealing with faulty devices or honouring their returns policy seem to be a bit iffy. So up to you whether it's worth saving the extra $38 than going with a more reputable retailer like Kogan.