Just bought this on Amazon US. Cheapest from a legit AU store seems to be about $170.
The USD20 coupon discount only visible with Amazon Prime which you can signup for with a 30 day free trial.
I actually bought it for AUD75 shipped with a few extra steps:
1) Signed up for free 30 day Amazon Prime trial - you can cancel anytime
2) Waited for email from Amazon with USD5 credit for downloading the Amazon app to my phone
3) Ordered Nokia Thermo and had shipped to a Amazon parcel point to save an extra USD1 on shipping
Expensive but seems like a good deal. I just bought an oricom one but am tempted to return it. The only worry is the US warranty rather than Australian.