Office Depot has 5-Packs of Ultra Colors or Neon Colors 3"x3" Post-It notes on sale for $1. 3M is offering a $5 Gift Card to McDonalds (limit 1 per household member) with a purchase of any 2 Post-It products via mail-in rebate. Combine 2 deals together to get 2 5-packs of Post-It's and $5 gift card for $2.
Use coupon code 50395084 to save an additional 10%. Choose in-store pickup to save on shipping, otherwise it's $10
