Buying Japanese textbooksEdit
If you can make the trip to Tokyo, Bonjinsha is THE place to buy Japanese textbooks. Other options include Kinokuniya in Shinjuku and Tower Records in Shibuya. There are many other book shops in Tokyo that stock Japanese texts.
If you already know what book you want, you can probably find it at Amazon.co.jp for the best price.
Borrowing Japanese textbooksEdit