General Mills is offering a FREE box of select Cinnamon Toast Crunch cereals for a limited time. To get this deal, buy an eligible size box of participating Cinnamon Toast Crunch cereal at your local store or online between 9/1/21 – 9/30/21. Keep your receipt and/or email purchase confirmation and submit it here to get a rebate up to $6.55 via Paypal, Venmo.