Check out the coupons at Walmart.com and print one for $1.00 off four Martha White muffin or biscuit mixes. Use this coupon and get mixes for only $0.73 each!

Buy 4 Martha White Blueberry Muffin Mix, 7 oz $0.98, regular price
Use one $1.00/4 – Martha White Muffin or Biscuit Mixes – (walmart.com)
Final Price: $0.73 each, when you buy 4