Try sampleswap.org; I got a fair few from there. Also someone else here recommended freesound.org which has plenty of royalty-free samples (sampleswap.org says its stuff is royalty-free but there's stuff there from movies like The Matrix which obviously ain't royalty free).
^It is dude ; I also stumbled across a snare hit sample there that's definitely been a staple in a lot of DnB tracks, or at least a few Roni Size ones. Didn't know it was from a Commodore tho.