The hard to find Elsa dress up outfits from the Disney Store are back in stock. They are $49.95- so not inexpensive by any means but these are really hard to find. If you have not seen them in person, they are really very pretty and the quality is wonderful.
I was in the Disney Store yesterday and heard a man saying he waited in line 6 hours to get one recently. I know this price is not for everyone but if you have been trying to get this one, I would not wait because it will sell out.
For another option, Amazon has the cheaper $20 dresses in stock. I saw both Elsa and Anna.

I tried to put one in my shopping cart and it’s sold out
Sold out! 🙁