User blog comment:PlantyThePottedPlant/Random Topic Blogging III: Blog Harder/@comment-25533515-20120914163516/@comment-4121682-20120914164630

If anyone's posted individual sound effects on YouTube, you can use RealPlayer to download the video and convert it to mp3 format.

And if you find a video containing multiple sound effects, you can use Audacity to splice out individual sounds after converting it from video to mp3.