Slightly unpostable, because the set itself has an ISBN (0-439-26011-6) but it has different books than what is listed on PBS. I know it is accurate as is, because the book contents are printed on the decorative cover. Each of the four individual books in this does have an ISBN as well. I'd hate to split them up, since they do come with a decorative cover, but will do so if I don't receive any interest in this posting. PBS site says suitable for children ages 4-8.

Here it is:

Amber Brown Boxed Set by Paula Danziger, (Scholastic Book Club edition):

I, Amber Brown
Forever Amber Brown
Amber Brown Sees Red
Amber Brown Is Feeling Blue

Would like 2 credits for this set of four books. Please PM if you are interested, can ship on Monday morning! 
Thanks! Melissa