With orders of $25 or more, Amazon offers Prime members the Disney Frozen Girls' Elsa Coronation Dress
with free shipping
. (Non-Prime members can spend $35 or more to qualify for free shipping.) That's $17 off list, a buck under our mention from July, and the lowest total price we could find. It's available in size 4-6x only.
Note that this item is part of Amazon's "Add-on program" and can only be purchased with an order of $25 or more.