From where i can get audio noise sample for classification ????

Hello everyone, I'am doing a work like i have to train nn to classify the different types of noise i.e. babble noise, street noise, car noise, airport noise, restaurant noise, subway noise train noise etc. right now i have the 1 sample for each types of noise but to train it in nn required more number of same types of noise which vary from each-other slightly. the samples that i have with me now i downloaded from sampleswap.com. Can anybody suggest me some sites from where i can get a fair size of samples. waiting for your reply please if anyone could suggest anything .................