get bento boxes at Jlist.com (Jbox.com if you are under 18 or don’t want to see pervy stuff)! they have other neato japanophile stuff too. most products ship from japan so there’s a bit of a wait time, but it’s the best place for bento stuff and the people are nice too.
get books about bento (and other subjects) at Powells.com! powell’s is located in Portland Oregon on a whole city block, hence the nickname “the city of books”. it’s a great environment, very indie and non-corporate.. and they know their books!!