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~*
Sanosuke Harada - Hakuōki: Shinsengumi Kitan
Kojirō Sasaki - Iza, Shutsujin! Koi Ikusa
Kenshin Himura - Rurōni Kenshin