I have discarded the idea of shipping books to the Philippines. Shipping is expensive and the books themselves may not prove to be useful to the children over there. This would be an inefficient use of limited resources.
Last year, I had a talk with the principal of the local public school and he had given me a wish-list of reading materials. I have since lost that list but what I do remember is the name of the supplier, Saint Mary's Publishing Corporation. It is one of the major suppliers for educational materials. Their website is under construction so after a bit of googling, I found their email address. I got a very prompt reply (sadly, not everyone over there is as prompt) from the President himself, Jerry Vicente S. Catabijan: