Scholastic just sent out a flyer for 75% off in their teacher store:
http://shop.scholastic.com/webapp/wcs/stores/servlet/en/teacherstore/nav/shops/Super+Clearance+Catalog/4294352162?eml=TSO/e/20130408////Clearance//ShopTout/RET//&ym_MID=1473089&ym_rid=16148800
Books for all grades.
Enjoy!
Takara
http://www.homeschoolsantafe.com