Browsing the camping and outdoors sale tonight and came across the Romoss Sofun 4 13000mAh power bank for $29.99 delivered. After a quick search, apparently they sell originals - https://www.ozbargain.com.au/node/159183
I took the punt and bought one anyway, and I'll see if it's an original when I receive it. The Sofun 4 comes with Samsung Li-Ion cells vs cheaper Chinese made cells in the Sailing models.
I have had one of these for 2 years now.. still going strong.