How IN the World Do I Get the Information Needed to Get a Tribal Enrollment Number When My Great Grandparents Had Numbers Still Told They Are Not...

I have done several genealogies for friends and cousins, now have a few who need to get enrollment cards like I want to. Have an epal who charges 1,000 to 7,000 to do this, sure wish somebody paid me, even for ink pens. Thank you. Have a happy and blessed day.