Listed as $169, with 5% eBay code it'll come to $160.55. 10% eBay code to get $152.10
For the best $/TB ratio, see this post to get the 2TB from JB-HiFi, so this is more for people wanting >2TB per unit, and local stock (warranty/shipping).
Thanks to the comments (see comment section), the 4TB is actually cheaper, as long as you don't mind buying and having it shipped from overseas (Amazon). Although the caveat would be overseas warranty (Amazon's global shipping time is quite reasonable generally).
Don't forget CashRewards.
portable and ultra portable?
Whats the difference?
Because can get 4 Tb portable from amazon for $152 delivered.