Check your Kraft First Taste account to see if you have an offer for the Homestyle Mac & Cheese. If you don't see it check back in a few days. Kraft sometimes releases the offers in waves.
If you haven't signed up for Kraft First Taste I would highly suggest doing it if you like freebies and to be in the know about new products. I have been sent 12 different coupons for FREE items over the past year. ( You do have to go into your account and accept the offers when they come up.)