Hida has prices on their website for their several levels of chisels, for some data points.

Some Ebay comps:

https://www.ebay.com/itm/23549531239...2B9VY6CNRZ3N56


https://www.ebay.com/itm/13502369519...8AAOSwimJj0VGJ

https://www.ebay.com/itm/29636915485...3ABFBMnJufx99j


https://www.ebay.com/itm/29619324834...3ABFBMmtH3x99j