I just received a Email if I wanted to pre-order a Sony VR headset, release is slated for October.
Price in Australia is $549 from JB HiFi [Aus wide the biggest electronic hardware seller]

One caveat is you need the Sony camera for the PS4 for it to operate, that's another AUS $84
So ATM Aus $630 for the system.

To make that relative, a new 1TB PS4 bundled with games costs Aus $549