As of March 21st 2020, the Bank of Namibia released a special N$30 bank note for the 30th anniversary of independence from South Africa. Maybe its too early but even the BoN website doesn't mention it pardon the official press notification: https://www.bon.com.na/CMSTemplates/Bon/Files/bon.com.na/54/54fb36cd-ddd6-40eb-b551-1fad4836166a.pdf Suffice to say it appears to be a nice note but again, given how early it is, I don't see much distribution for this yet (having looking briefly).
https://www.namibian.com.na/91090/read/New-N$30-note-available Seems the note as of today is now available in the local banks. It is a really nice example so hopefully supply online starts to get going over the next few months.