Great Price Fast Service via Amazon offers Prime members the Disguise Girls' Disney's Frozen Anna Deluxe Costume for $8.76 $8.99 with free shipping. (Non-members can spend $49 to qualify for free shipping; otherwise it adds $6.06.) That's the lowest total price we could find by $14. The dress comes with sheer blue sleeves and and a dark blue satin skirt. It's available in girls' sizes 7-8.

Update: The price has dropped to $7.99.