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I haven't come across any websites or forums that have those kind of audio files/clips. What you could alternatively do is use a audio recording program (e.g. Total Recorder) and record those sound effects live from an OP episode.
I recommend you download Audacity. Definitely the best free audio program imo for such purposes as yours. Hope this helps.
Edit: have you tried checking youtube for those kind of clips? You could use a youtube to mp3 converter lol if you don't want to use my inital suggestion.
Last edited by Bugzee; July 15, 2010 at 07:29 AM.