I believe extra license is the place where you should look for a license. They are known for selling, second hand licenses. You could find several offer with plugins and without plugins.
As everyone stated, make sure to validate the license. If someone is selling it for cheap like 20$ or 30$, then, it would be a valid reason to be suspicious. Just so you know, a second hand license can never be transferred to anyone else. So, even if you don't have any use to it anymore, you would be stuck with it.
Good luck with your search.