FREE Charbuger with Cheese

Go to http://www.habitburger.com/ and you’ll see an offer slide in from the right side of the page.
"Free Charburger with Cheese
Join the Charclub between Feb. 21 – Mar. 31 and receive a free charburger with cheese in your inbox!"
Scan-able barcode came quick.
According to the FAQ, substitute whatever you’d like as long as the price is the same.