Go to http://arbys.com/get-deals and sign up for their Arby’s Extras club. When you first sign up, you’ll get an offer for a free roast beef classic.
Offers arrive in your email periodically. Usually you click on a link in them, which goes to their site, you enter your name, then print the coupon. I just looked and this one actually looks like it might just be good without being a member of the Arby’s Extras club. It even says you can show the coupon from an electronic device.
This offer for a free Chocolate dessert is the latest.