The cost of Tamahagane steel can vary significantly depending on several factors such as quality, purity, availability, and the specific market or seller. Tamahagane steel is considered a premium material for sword-making, and its production involves a labor-intensive and time-consuming process.

As a result of its rarity and the craftsmanship involved, authentic Tamahagane steel blades can be quite expensive. The price can range from thousands to tens of thousands of dollars, and even higher for exceptional or historically significant pieces. Factors such as the reputation of the swordsmith, the quality of craftsmanship, the blade's condition, and any accompanying documentation or provenance can also influence the price.

It's worth noting that there are also alternatives and variations of Tamahagane steel available that may be more accessible in terms of cost. These alternatives may still provide good performance and aesthetics, though they may not have the same level of historical authenticity or rarity associated with traditional Tamahagane.

If you are interested in acquiring a sword made with Tamahagane steel, it is advisable to consult with reputable dealers, swordsmiths, or collectors who specialize in Japanese swords. They can provide specific information about the pricing, quality, and availability of Tamahagane steel blades in the market.