Search in you tube how to make phantom mask, most likely Michaels will have supplies to make one. From super easy to really fancy. Although, the phantom of the opera mask is super easy.... another few places to look for easy instructions to make one is pinterest, Instagram, or Google 'how to', just like YouTube.
Try a Costume place or order on Amazon
Try; Party City in Pacific Coast Plaza @Jefferson & Vista Way. Michaels won't have it.
Thanks! Your answer is awaiting moderation.