Institute for Excellence in Writing (IEW) has my favorite language arts curriculum.
The following is from http://iew.com/clearance13:
Cyber Monday Clearance Sale 2013!
Join us for our Cyber Monday Clearance Sale 2013
Dec. 2–6, 2013
Come back to get a coupon code good for 50% off clearance items!
(Code will be posted on Dec. 2 at 9AM CT.)
We will fulfill orders according to when they are received. If you inadvertently purchase out-of-stock items, we will automatically issue you a refund and notify you immediately via email.