Halloween.biz is keeping track of halloween costume coupons and costume discounts on various web sites:
HalloweenCostumes.com Coupons: on the Coupons & Discounts page at HalloweenCostumes.com!
Costume Craze Coupons: Save up to 90% on Costumes and Accessories!
Costume Discounters Coupons: $10 Off Orders $50 or More! Use Code WOW10. Expires 10/31