You can get an offer for a FREE Sandwich at McDonald's (Sausage McMuffin with Egg, McChicken or Cheeseburger) when you sign up. No purchase necessary Click here and enter your email and zip code to sign up. Valid 1x thru 12/31/21 at participating McDonald’s. Sausage McMuffin with Egg only available during breakfast hours. Offer should arrive between 24 and 48 hours after registration.