As a father of two girls also, let me say that I feel your pain. But it doesn't end once you have searched the web for hours on end and called every
Disney store within a 300 mile radius. It continues once you finally find the dress, beg the staff at the store to hold it for you until you drive through a snow storm, in the dark, to get it. Then your daughter decides to start wearing the dress at home, only for you to find out that the Elsa dress is by far the most sparkly dress of any Disney princess dress they have ever owned and almost all those sparkles will blow off her dress like actual pixie dust being dropped by Tinkerbell herself. Of course no amount of vacuuming will get rid of it all and you will find every article of clothing you own somehow gathers it up for weeks on end. I particularly was fond of noticing the sparkles on my toothbrush (how I don't know, but there it was). I just can't wait to pack that dress in our luggage with all the other clothes!!