Have you ever tried making your own? I think you would get a lot more satisfaction out of creating your own regardless of how good or bad they sound. If you have the time and inclination, I would plug a microphone into the sound card and even if you only have sound recorder, start banging, rubbing, twisting, hitting even breaking objects and record the sound made from them and see what they sound like. You might be quite suprised at what sounds you can create on your own.

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Better than a poke in the eye with a pointy stick any day...