I was just looking into it, with coupons and ongoing sale, it is possible to buy the Chinese version for about 7,500 JPY (45 USD) on Aliexpress, while on the official website (and Amazon) it is 13,900 JPY. I am not sure if this applies everywhere.

While there is an "unlock" option, it seems it is strongly implied that you should stick to mainstream custom firmware or risk getting stuck with a firmware forever [0].

[0] https://github.com/crosspoint-reader/crosspoint-reader#usb-l...