Even in this style there are a number of factors that can affect price like steel and materials selection. Simple answer anywhere from a few hundred on up.
Yeah but you can get knives that are mass produced but still made with quality steel, even super steels and even put together well and fairly inexpensive. But hand made unique orders based on a customer's request can take several days to months to create and to interact with the client and well, as an artist offering a unique service and high quality, how much would you expect to pay for the time. So custom work can get expensive.