Wikipedia
BuyCostumes.com is a major US-based costume retailer headquartered in New Berlin, Wisconsin. It is an e-commerce company that sells costumes and costume accessories for children, adults and pets, as well as party supplies for year-round occasions and seasonal indoor/outdoor décor. It is part of a family of costume and party brands owned by a larger corporate entity, BuySeasons, Inc. that includes CostumeExpress.com, BirthdayExpress.com, CelebrateExpress.com, and 1stWishes.com. BuySeasons, Inc. is a part of Liberty Interactive Corporation, which is owned by Liberty Interactive.
BuyCostumes.com refers to itself as "The Online Leader in Halloween Costumes since 1999," offering more than 10 billion costume and accessory combinations.