TAPES and books for kids....help!

I’ve been asked to purchase some basic and intermediate English books WITH TAPES for kids at an orphanage I’m going to visit next month (not in Taiwan).

They have twice-weekly English classes but want to do some extra study in-between. They specifically asked for something that uses a phonetic system of teaching English.

Hmm, I’m not a teacher and have no idea where to go or what to buy.

Can anyone suggest any good beginners & intermediate books as well as tapes to use? They are relying on me to get this right (eep).