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The cheapest way is a solution that monitors for high-speed keystroke injection, which is what the rubber ducky is generally used for. One such project is https://github.com/pmsosa/duckhunt (I have no affiliation with this project. It appears to have been updated about 2.5 years ago)
I was able to find these: https://penteract.net/blogs/blog04/Main/High-Tech/Security/Block-Covert-Keyboard.aspx https://github.com/JBalanza/USBBlocker
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.