Does anyone have any suggestions of where to get a wig for a Leekeworld Rihael?

Somewhere that isn’t Leekeworld? I’m really at a loss for this boy right now! :( I’m just looking for a long black wig, preferably with bangs but it doesn’t have to have them. His head size is 9-10 but his head really is massive and it’s a hit and miss whether or not 9-10 will fit.