Right now you can save 75% Off Halloween Costumes at Hot Topic. Besides for the awesome sale prices, now is the ideal time to buy because you can still order with standard shipping and get it before the pre-Halloween weekend (by October 26).
There are almost 200 different costumes on sale, with choices ranging from Harry Potter, Suicide Squad, Nintendo, and Beetlejuice to Marvel, Nightmare Before Christmas, Rick and Morty, and Marvel. Just visit the Up To 75% Off Halloween page at Hot Topic to save.