Martha White Cake mix is on sale at King Soopers (and Kroger) for $1.20. This sale matches up nicely with this $0.55 off any two Martha White Baking Mixes printable coupon to make them only .70 each!
Here is your scenario:
Martha White Muffin Mix $1.20
–$0.55 off any two Martha White Baking Mixes (direct link)