Check to be sure your school is in the list (link in comments) and then try each code to find the one that works for you.
Save 10%-25% off School Photos from Lifetouch when you apply the code in the "apply code" window on the final cost page. Terms vary by school, and not all schools participate in the online ordering. Check link in comments to see if your school is participating. The discounts apply when you pay in advance and also on photo reorders. Expiration date is unknown.