My son likes the Wee Sing books with the audio cassettes or book on cd included, does PBS trade the set of these or trade them seperately? If you can trade these as the set, is it three credits for the book and the book on tape/cd?

If you do a search for Wee Sing, you'll find that it varies. Some are book only, some are book and tape, some are one credit, some are two. The credit price seems to depend on whether the system has them listed as audio cassette or paperback. None of them are three credits.

I would say the best thing to do if you want to request them is put together some requestor conditions that say "I am requesting a Wee Sing book and cassette or book and CD-ROM from you. Please do not accept this request unless you will be able to send BOTH the book and the cassette or CD."

You can turn these on when you're requesting Wee Sing books, but off for everything else.

Also, audio books cost 2 credits, just so you know.  If you ordered one that did not come with a tape or CD, it would just be one credit.