A Costume Affair - Halloween Costume store is a Costume Boutique located in Walnut!  We have the largest selection of Leg Avenue Costumes for Adults in the area!  And we have custom made children's costumes you can't find anywhere else!  Costumes start at $10 for kids, and $20 for adults!  Mention LosAngeles.com and recieve $5 OFF any purchase of $50 or more (excluding clearance items).