How much will a Starship cost?

Could you please elaborate on the factors that would determine the cost of a Starship? Are we referring to a fictional spacecraft from a science fiction series, or a real-life space exploration vehicle? If it's the latter, what kind of technology and materials would be involved in its construction? Additionally, would the cost vary depending on the size, capabilities, and intended purpose of the Starship? Understanding these details would help us provide a more accurate estimate of its potential cost.