Ultimate Soundbank Big Fish Audio
Vocal Download
Rapid4me
Looperman
Vipzone Samples
Sampleoidz
The Freesound Project
Acapellas 4U
Crowley'z World
Soundproz Put brackets around the 6 to get the link to work.
Sampletracks
Freesoundz
Platinum Loops
ccMixter
SampleSwap