The cost of a bamboo katana, also known as a shinai katana, can vary depending on factors such as the quality of materials, craftsmanship, and brand. Generally, a bamboo katana is more affordable compared to a traditional, fully functional katana made of steel. Here are some general price ranges for bamboo katanas:

1. Basic Training Shinai Katana: These are entry-level or beginner-grade bamboo katanas, often used for introductory kendo or martial arts training. They typically range from around $20 to $50.
2. Intermediate-Grade Shinai Katana: These bamboo katanas offer improved durability, craftsmanship, and performance. They are suitable for intermediate-level practitioners or those seeking a better quality training weapon. Prices for intermediate-grade bamboo katanas can range from $50 to $100.
3. High-End or Custom Shinai Katana: These bamboo katanas are made with higher-quality materials and craftsmanship. They may feature premium bamboo, reinforced slats, or specialized designs. High-end or custom bamboo katanas can range from $100 to $200 or more.

It's important to note that these price ranges are general estimates, and actual prices may vary depending on the brand, seller, or specific features of the bamboo katana. Additionally, the prices mentioned here are specifically for bamboo katanas used for training and practice, and not for functional or decorative katana swords made of steel.

When purchasing a bamboo katana, it is recommended to consider factors such as durability, flexibility, and craftsmanship. It's advisable to research reputable sellers, consult with experienced practitioners or instructors, and read customer reviews to ensure you are purchasing a quality and suitable training tool for your needs.