Arby’s Coupon: Free Small Jamocha Shake with Any Sandwich Purchase! April 8, 2015 by Jennie The links in the post below may be affiliate links. Read the full disclosure.Print Email Heading out to lunch? Don’t forget to print this coupon first! Arby’s is offering a FREE Small Jamocha Shake with the purchase of any sandwich. This offer is valid April 8th through the 14th.