Asus T100TAF-BING-DK046B 2 in 1 Laptop for 432 after $25 Microsoft cashback (after activation of Office 365) at both Binglee and Harvey Norman.
Intel Atom/1.33GHz Quad Core - 2GB - 64GB EMMC - 10.1" - Windows 8.1
Binglee
Harvey Norman
Dicksmith has a similar spec'd T100 TA-DK003H ( processor is Z3740 instead of Z3735F) for $374 after cashback, original model is $499.
Updated
HN one comes with bonus 7" tablet, no idea what brand. Thanks to @Holmes.
you can apply royal14 to dicksmith one at it takes it down to $343