The cost of a real katana can vary widely depending on a number of factors such as its quality, craftsmanship, materials used, and its historical or cultural significance. In general, an authentic, high-quality katana can cost anywhere from a few hundred dollars to several thousand dollars.
A basic, entry-level katana made with lower quality materials can be purchased for a few hundred dollars, but it may not be suitable for serious practitioners or collectors. On the other hand, a premium, handcrafted katana made by a master swordsmith with high-quality materials such as traditional Japanese steel, can cost tens of thousands of dollars.
It is important to note that there are many imitation katanas available in the market, which may look like the real thing but lack the quality and authenticity of a true Japanese katana. If you are interested in purchasing a real katana, it is recommended to do thorough research and seek the advice of experts to ensure that you are getting a genuine, high-quality sword.