IF they don't increase the amount what I did for multiple wigs was I made one listing for a few of them and in the description field I listed out the separate cost for each wig. You could try that.
~2016 Con Schedule~
Anime Boston, Boston MA
Another Anime Con, Manchester NH
Rin Matsuoka - Free!
Soma Yukihira - Food Wars
Caesar Zeppeli - JoJo's Bizarre Adventures
Rohan Kishibe - JoJo's Bizarre Adventures
Tamaki Suoh - Ouran High School Host Club