Amazon has dropped their price for the Western Digital WD100EFAX US$349.99 (~AU$478). Shipping to Australia is approx US$10 (~AU$13 - shipping to VIC). Cheaper if you opt to use ParclePoint.
First time it has dropped to this price according to CamelCamelCamel. Previously US$379.99
http://camelcamelcamel.com/product/B0719498XY
Note that this is not the PRO version. This is the 5400rpm version.
AUD figures figures based on FX conversion Amazon, you may get better rates through your credit card.
Product link: https://www.amazon.com/dp/B0719498XY
The same price Here for AU stock with PREZZY.