I thought I'd try some of the ethnic samples from Discovery Sounds, since they got great reviews in a couple of magazines. They are without doubt the noisiest samples in the world. I've heard less hiss, hum and buzz on recordings of farts and belches made with dictaphones in a windstorm.
I've bought a couple of the Battery libraries, which are very cheap indeed, but then they only include about 20 samples, so they should be cheap. And I've had to spend a couple of hours cleaning them up, not very satisfactorily. Steer clear.