For what it's worth, katana prices (I don't pay attention to tanto or wakizashi prices) at Aoi Art and other online dealers who have a Western clientele have been trending up in the last year. This is probably due to the increase in international demand caused by the weaker Yen.
A TH katana with koshirae from a regular smith listed on Aoi 2 or more years ago went for somewhere between 700,000 to 950,000 yen, whereas they're being listed for about 1,200,000 yen recently. I was still even able to buy a few TH katana in shirasaya as recently as in early 2024 for 600,000 yen each.
However, prices on Yahoo Japan have been fairly consistent because they mostly cater to their domestic collectors.