I have looked at several other sites, Unique Japan, Seiyudo, Samurai Museum, and others that come up in searches, and while this Tokyo Nihonto site claims to have NBTKH for them. How is it possible that they are selling these nihonto for ~2-5k when others are selling them for ~10-40k?
Tokyo Nihonto | Authentic Japanese Swords for Sale (tokyo-nihonto.com)