How much would you charge to make one
3D print file is avaialble for free at https://www.do3d.com/forum/free-3d-print-model-list/free-3d-printable-model-black-panther-civil-war-classic-helmet-by-do3d-com but if you are talking about the 3D printed ones, you can ask @jorden23 because he printed this helmet. If he is unable to help you, please contact firstname.lastname@example.org with your location and deadline. We will find someone who can assist you.
Sure I can print one for you message me the details.
Here is the finish helmet.