I found a few. This is my favourite www.looperman.com . If you need more please ask. Remmember to make sure your BPM (Beats per Minute) match precisely or the whole sample/song will loose timing/rythm. I hope i was of help. :D
You get what you pay for and I have tried tons of free downloads and I cannot do much with them. I finally had to spend the money and found a badass cd from Kazhawanna. I can make my own loops with the kits and it comes with tons of preprogrammed loops you can edit. You should check it out. Kazhawanna.com.