You can always buy, or make your own cosplay wigs! But i would suggest that you try looking around for instructions first! so here are a few websites to get you started!!
1- http://charmedseed.livejournal.com/10260.html for sailor moon hair ONE OF THE HARDEST!!
2- http://www.cosplay.com/photo/2514225/ Is for kikyo's wig. It's the same instructions I used. Well not instructions but it's easy to make!!
3- http://costumesplanet.com/cosplay.php?psps_search=Inuyasha this covers all Inuyasha character costumes
So thats all but you can always find more AND if you want to (PLEASE DO) send the info & site URL code to my email @ Inuyasha2011@live.ca!! THNX!