I found Betty Crocker cake mix at my Dollar Tree. Print a $0.75/3 coupon, and get three boxes for just $0.75 each! Remember, the Dollar Tree coupon policy limits you to two printable coupons per day, per household.

Use one $0.75/3 Betty Crocker Baking Mix or Frosting (coupons.com)

Final Price: $0.75 each, when you buy 3