Thumb Score: +20 Amazon has 15.25-Oz Duncan Hines Signature Perfectly Moist Carrot Cake Mix for $1.09 - 5% when you check out via Subscribe & Save = $1.04. Shipping is free with Prime or $35+ orders. Thanks to Deal Hunter BBQchicken for finding this deal. Note, you have the flexibility to manage your Subscribe & Save subscription at any time after your order ships.