FREE Box of Horizon Mac & Cheese on Facebook! July 28, 2014 by Rebekah The links in the post below may be affiliate links. Read the full disclosure.Print Email Head on over to the Horizon Organic Facebook Page where you could score a coupon for a FREE box of Horizon Mac & Cheese! The first 25,000 registrants will receive an email with a link provided. You will need to go through this link to enter you mailing information and can expect to receive your coupon in 8-10 weeks.