...or require you to advertise their site....
I'm not sure whether this means that you're not interested in Creative Commons sounds, but if you're ok with attributing them (and I imagine you'll have some libraries to attribute too), then freesound.org is probably what you're looking for. I had a quick browse for something which fits your description and turned up
http://www.freesound.org/samplesViewSingle.php?id=29806 but you'll want to investigate yourself because you have a better idea of what you want.