If you go to Japan, check out a place called Tokyu Hands.. tons of paper notebooks, pens, pencils, pencil organizer pouches, tons of awesome stuff..
Muji has several stores in the U.S. and ships within the U.S., and they have really good paper, notebooks, and pens.
I'm hoping they can bring them back, though, there's nothing to compare to. In the meantime, online shipping works fine for what they happen to offer on the website, and that stock has increased recently, which is encouraging.
I can recommend their luggage in particular, there's just nothing quite like it.