Amazon offers its Prime members the Disney Frozen Princess Sisters Celebration Anna and Elsa Doll Set, model no. DFR78, for $4.74 with free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $6.04.) That's the lowest total price we could find by $4. They measure 8" tall.

Orders placed by December 22 are guaranteed to arrive in time for Christmas via Prime shipping.