Children's English Books

Hello,

I am currently teaching English to children and am in search of books.
I have many books but require some which are aimed at younger children (under 6)

Does anyone know of any shops/markets in the Wiesbaden/Mainz area that stocks children's books?
(I have already tried Oxfam)

OR

Do you have any books that your children may have outgrown and are collecting dust?

Thanks in advance.

buch habel at kirchgasse 17 in wiesbaden probably has something. i also teach english to young children and have always used german books. they are cheaper and since the kids i teach cant read, i just pre-translate (in my head, or on note cards) and "read" in english while they look at the pictures. )