I have just seen it on Costume Craze, the Nightmare Before Christmas costumes are getting cheaper. So if you were in a purchase mode, you’ll find the deals at Costume Craze with these links :
Now all standard costumes are $20.99, Plus size at $27.27. Deluxe at $34.99.
If my memory is good, you save $10 to $15 dollars depending on the costume. Enjoy !