Seagate Expansion 6TB Desktop Drive $170.78 + $20.72 Delivery (Free with Prime) @ Amazon AU (via US)
Seems like a pretty decent price for this drive, at ~$28.5/tb.
Not the lowest price historically though (based on CamelCamelCamel stats for Amazon US).
Ships from Amazon US. Comes with a power adaptor (im guessing a US plug?).