Use this printable coupon which is in PDF format (this is a legit coupon straight from the 3M website) and can be printed an unlimited number of times to get free Post-it Sticky Notes for FREE at Target this week. They are on sale for $1 each. Coupon expires 9/30.
Using the same coupon, you can get Post-it Page Markers for 9 cents each at Staples as well!
(Thanks, Deborah!)