This site makes what looks like 100’s of children’s hebrew books available in pdf format for download for free. The books are sweet stories, there are often times very nice illustrations as well. You have to weigh the costs of print cartridges I guess against cost of new books. But, its definitely worth a look.

http://sefer-li.net/

There are also a number of books that have been translated from Spanish, Polish, Italian and English into Hebrew which is nice if you are looking for a book you are familiar with. The site is in Hebrew so you will have a hard time navigating it without being able to read and understand Hebrew.