Just an FYI Chasing Fireflies has Anna and Elsa dresses! I just received a catalog in the mail but I'm sure they are online too. Chasing-fireflies.com
I just heard that Party City has also started to get them in...
Yes, Party City has them. (I was just there getting tattoos for our MBs). They also have wigs, slippers, tights, headbands, etc.