It seems the Get Knoppix page on this website is out of date. All of the buy Knoppix links no longer work and I believe that OsDisc.com has been out of business since at least last summer.
http://knoppix.net/get.php

I've been buying the Knoppix USB's from ShopLinuxOnline.com, but the latest version that they have is 8.6.1
https://www.shoplinuxonline.com/linux-usb.html

Suggestions?

Thanks - Dave