If you have until the next Saturday maybe you would have enough time to order from some USA based wig company like Arda or TheFiveWits in you choose faster shipping? Just saying all hope might not be lost yet.
*~Cosplays in progress~*
Masamune Date - Sengoku Basara
Eren Yeager (casual outfit) - Attack on Titan
Sanosuke Harada - Hakuōki: Shinsengumi Kitan