Last year they had the adult costumes 1/2 off before the Halloween. I also believe the children's were on sale before hand but I am not positive on that.
i may or may not be putting some princesses coustumes from last year on an auction site in the next few days size4/5. we were supsosed to go last year and i stocked up, and now that we are going this year they dont fit.....
you would be ok to wait if they have more than 1 disney store in your area..... but try them on first. we had a snow white one, and when my daughter tried it on, she hated it, and said it was too scratchy........
Every year they do go on sale online, usually for less than $20 right before Halloween. I have bought several and had them well before. Keep your eyes open.
I am rather disappointed with the selection this year, though. They have had better in past years. I also need to buy some early this year as we are going to MNSSHP on 10/12 and will need the costumes then.
I go on EBAY and find lots of great stuff. DGD has just about every princess costumes there is out there. Some "stuff" is brand new. Ebay is greaaat!!!