Are you willing to wear a wig?
Jade Harley from Homestuck
Yuno Gasai from Mirai Nikki
Mifune Ryouko from Denpa Onna
Shiemi Moriyama from Ao No Exorcist
Liechtenstein from Hetalia
Seychelles from Hetalia
Haruhi Fujioka from Ouran Highschool Host Club
I'm pretty sure all of those could be done for around $100 nothing too amazing, but 100 is a pretty small budget =/
Kairi from Kingdom of Hearts
Rukia from Bleach
That's all I can think of! >_< I hope I helped!
Upcoming Conventions: Katsucon, Anime Detour, Wizard World Minneapolis, C2E2
Ino Yamanaka- Naruto Stage Play Live
Maya the Siren- Borderlands
Akko Kagari- Little Witch Academia