The cost of a replica katana can vary depending on various factors, including the quality of materials, craftsmanship, level of detail, and the reputation of the manufacturer or seller. Generally, the price range for replica katanas can be as follows:

1. Decorative/Display Replicas: These are typically mass-produced replicas intended for decorative purposes, such as home decor or cosplay. They are often made of lower-quality materials and lack functional capabilities. Prices for decorative replicas can range from around $30 to $150.
2. Mid-Range Replicas: These are replicas that offer a balance between affordability and quality. They are often made by reputable manufacturers and have better construction, materials, and attention to detail. Prices for mid-range replicas can range from $150 to $500.
3. High-End Replicas: These are premium-quality replica katanas made by renowned manufacturers or skilled craftsmen. They often feature exceptional craftsmanship, attention to historical accuracy, and high-quality materials. Prices for high-end replicas can range from $500 to several thousand dollars.

It's important to note that the prices mentioned above are general estimates and can vary based on the specific features, brand, and reputation of the manufacturer or seller. If you are considering purchasing a replica katana, it is advisable to do thorough research, read customer reviews, and consult with experienced collectors or enthusiasts to ensure you are getting a quality product that meets your needs and expectations.