July 13, 2013 No Comments FREE King Size Butterfinger at Kum & Go Get a FREE King Size Butterfinger at Kum & Go. Must show barcode in-store on phone to redeem. Available while supplies last at participating locations. Valid through July 17, 2013. Locations. FREE King Size Butterfinger at Kum & Go – EXPIRED Facebook Twitter Add Comment Notify me of follow-up comments by email. Notify me of new posts by email.