Arby’s is offering a Free Classic Roast Beef sandwich when you purchase a drink and sign up at their site. It only takes a minute to sign up, then you will get a printable coupon to redeem at your local Arby’s for a Free Classic Roast Beef sandwich. Just sign up and purchase a drink to get the Free Classic Roast Beef sandwich. There is nothing better than free. Grab this printable coupon for your free Arby’s sandwich.