Here are some choices.
https://www.google.com/search?q=gamora+wig&client=ms-android-att-us&biw=320&bih=490&tbm=shop&prmd=sivn&tbas=0&tbs=cat:181,vw:g,init_ar:SgVKAwi1AQ%3D%3D,p_ord:p,mr:1&ved=0ahUKEwj_9OXg7vrYAhWrhlQKHbdfBKIQsnMI8gM&ei=st1tWv_TMKuN0gK3v5GQCg