Post-It has some coupons available to print on there site, plus coupon for other 3M products. There is a coupon for:
$2 off a $10 or more of Super Sticky notes
$1 off a $5 or more of Super Sticky notes
$2 off a $5 or more pop up dispenser (great for a teacher)
$1 off 1 Scotch pop up tape dispenser or refill
And more, there are coupons for Ace bandages, Nexcare, Scotch-Brite.
The Post-It coupons can be stacked with Target's store coupon to save even more on those school supplies.