Different materials and types of doors cost differently. It all depends on what you choose. You can surf the Internet or look through specialized websites like https://www.internaldoors.co.uk/internal-doors/1930s, where you can find something you need. It’s not that hard to choose one. However, I still recommend you do a little research and read a little more on different forums on how to choose the right impact door for your house or another building. It’s better to choose a good one right from the beginning rather than change it later.