Amazon offers Prime members the Disney Frozen Fever Singing Elsa Doll, model no. DKC57, for $9.05 with free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $6.20.) That's the lowest total price we could find by $11. The doll sings "Making Today A Special Day" when you press the flower on her dress.

Update: The price has risen slightly to $10.86.