Individual Pacs are available to purchase on Christianbook.com for $11.50 each. 

Below are a list of the pacs contained in this set.
The total for the boxed sets new was $468.00
 
Language Arts - Teacher Guide
Language Arts Student - Units 4 - 10
Math - Teachers Guide
Math Student - Units 6 - 10
Science - Teachers Guide
Science student - Units 7 - 10
Bible - Teacher Guide
Bible Student - Units 5 - 10
History & Geography - Teacher Guide
History & Geography Student - Units 6 - 10