Book search: one liter of tears (ichi rittoru no namida??? T_T?

I wonder do anybody know where can I buy the original book of one liter of tears ( Ichi rittoru no namida ) by Kito Aya. ISBN-10: 4344406109 ( ISBN-13: 9784344406100 )in United States. Because I really like that TV drama, so I want to read the book too. Even if it's in Japanese. I really appreciate all of your helps. ^_^|||Have you tried Amazon? They have an International section. The Japanese site can be viewed in English.