While on Monash University's Clayton campus recently, I was pleased to see the bookshop stocks a selection of Kokuyo Campus products including folders, dividers, loose paper, and bound notebooks. I find this very similar to the sample of Apica paper that InkyPete sent me (thanks again!).
They included a few unusual ones - B5 loose paper which was ruled the length of the page rather than across it, and B5 paper marked with musical staff notation lines.
So, if you're closer to Clayton than the CBD or you are after some musically-marked Kokuyo paper, check out the Monash Uni bookshop, in the campus centre.
(No fountain pens from what I saw, but my time was limited so I may have missed them.)
Regards, Myles.