I don't know the legalities of distribution but the dos version 2.04g of pk is readily available and pkware does not seem to go after the sites that web-post it.
<a href="http://wuarchive.wustl.edu/languages/oberon/OberonV4/Windows/pkzip204.exe" target="_blank">http://wuarchive.wustl.edu/languages/oberon/OberonV4/Windows/pkzip204.exe</a>
(Virus check, naturally.)
I believe the unzip utility that comes with this distribution is actually freeware. All three utilities that come in the file are command line.
The original Win versions of pkware were nagware but did not time out. They do not seem to be around anymore.
If you just want to drag, drop, and unzip for free then try Alladin's Stuffit Expander.
<a href="http://www.stuffit.com/expander/winindex.html" target="_blank">http://www.stuffit.com/expander/winindex.html</a>