copied from a thread i started over on psyforum, here's a load of links to websites that host free audio samples for download. (all checked working)
http://www.killerbeats.com/ (need to be logged in)
here's a search engine for samples: http://www.findsounds.com/
if you're using firefox then there's a plugin called DownThemAll! (https://addons.mozilla.org/firefox/201/) which may save you a lot of time if you're downloading a lot of samples.