Elmer's Glue at Staples

Stationaries are suppose to be cheap, but definitly not at Staples. My perspective has changed a bit today though. They are having a sale this week. Most of the "more useful" sale items (pen, index cards...etc.) are out of stock which is really annoying, but the Elmer's Glue is a funny one.
You walk in the store and there's a whole basket of Elmer's Glue. The are regularly priced at $0.99 each and with the current sale, you get $0.99 instant savings, which means it's free.

I get two of them, walk to the cashier, hand them the glues (thinking... FREE? really?). They scan it, and the receipt prints out. "Thank you for shopping at Staples. Have a good day!".

Now, I have never ever gotten a reciept like this in my whole life!!!