Need more space?! Originally spotted $15 instant off from B&H for Hitachi Touro Desk DX3 USB 3.0 4TB External Hard Drive (Black). However after a bit of research found that the same drive is cheaper at Amazon UK. £140 - VAT + £17.05 postage = ~AUD$202 delivered. You have to buy 4x such drive from B&H Photo Video to save enough on combined postage to match Amazon UK's price.
Do note that these are external powered drives so you'll need one of those $2 adapter for the AU socket.
CamelCamelCamel 
Keepa.
Open it???
Interested to see what drive is inside
Hitachi Deskstar 5K4000 Specs (HDS5C4040ALE630) according to http://forums.overclockers.com.au/showthread.php?t=1015860
lol n00b reply
Its only 133 British pounds delivered to AU. VAT is taken off automatically at checkout :-)
if only you after Hitachi……..(external or internal)
4TB external WD was $199 locally(with 4TB WD internal drive), but expired
http://www.ozbargain.com.au/node/91218
nontheless, this is still the best deal for 4TB at the moment until some local stores beat it!
If its no longer available then it's not a deal is it!
In addition, if you read the thread, the drive inside was an Hitachi anyway
But there is no way that I am putting those WD drives in my array. I'll take the Hitachi's over the WD anyday.
Anyone want to buy 10 empty external cases? :P
I saw someone successfully selling USB3 cases on OCAU for ~$10 each.
Too bad there not internal drives =(