'Harry Potter' HBO Series Set to Be Among Most Expensive Ever

• HBO's 'Harry Potter' series is projected to be among the most expensive series ever produced by HBO.
• The series is expected to rank alongside the final season of 'Game of Thrones' and 'The Last of Us' in terms of production costs.
• The original 'Harry Potter' movies turned J.K. Rowling's novels into a multi-billion dollar franchise.
• The series aims to set a new franchise record with a reported budget of $250 million.
• The production accounts suggest the series will be a significant investment for HBO.