Arby’s: FREE Roast Beef Sandwich with Drink PurchaseMarch 29, 2010 by Mitchell Wischmann This post may contain a link to an affiliate. See my disclosure policy for more information. Arby’s has a great coupon available! Go here to print a coupon valid for a FREE regular Roast Beef Sandwich with the purchase of any soft drink. This coupon expires on 4/10/2010.