How much does 400 bricks cost?

Could you please elaborate on the context of the question, "How much does 400 bricks cost?"? Is this for a construction project, a hobby, or some other purpose? Additionally, the cost of bricks can vary greatly depending on their quality, size, and material. Without more specific information, it's difficult to give an accurate answer. Could you provide some additional details so that I can better understand the situation and provide a more informed response?