Free Jamocha Shake at Arby's WednesdayThis free event has ended, but find upcoming FreebiEvents here. Arby’s is celebrating their 50th Anniversary with free Jamocha shakes for everyone! Request your coupon today for a free 12 oz. Jamocha Shake on Wednesday, July 23Offer not valid with any other coupon or offer. While supplies last. Limit one coupon per customer.  At participating U.S. locations only.