I am one of those persons who likes to order stuff WAY before the holidays, bdays or any occasion. Same for halloween costumes for me and my family. Searched online, and found that costumeparty.com has a HUGE selection of halloween costumes - in fact thousands. Also, as they mention, it appears they have most major licenced costumes.
Ordered 4 and got them within 4 business days after ordering. Items were packaged well, and all of us did try on the sizes, and they are close to perfect. I am a happy camper for sure!