Arby’s Roast Beef Sandwich $.64 Each July 21, 2011 2:02 pm By Lori Post contains sponsored/affiliate links and I get commissions for purchases made from links. As an Amazon Associate I earn from qualifying purchases. To celebrate their anniversary, Arby’s is offering $0.64 Roast Beef Sandwiches with THIS printable coupon and the purchase of a 22 oz. drink. Valid this Saturday 7/23 only.