The next two books were also found in Kinokuniya:
I found the following five books in Music Book Room in Bras Basah Complex; I remember that evening when I was at Jack's Place for dinner and noticed this shop on the ground floor...and the name of the shop was enough to get my attention. I rushed over after ordering my food and they were about to close, with many of their things already brought in. I barged in and asked breathlessly if they had Jay Chou piano books and voila! Out came four different editions! I browsed through, whilst apologising for keeping them waiting and eventually, as I could not decide which one to get, decided WTH, to get them all...lol! Absolutely no regrets as each had something different to offer and I've had a ball trying out all the arrangements!
I was probably in the right place at the right time when I found all these books 'cos I don't see them in the bookshops of late anymore....except for the black Secret book. :)
Update on 16 Sept 2012:
Popped by Music Book Room and found another Jay piano book...happiness! This one has a few of the songs from his latest album, Exclamation Mark!