Free stuff is always good!
1)Sample magic released a demo pack of loops and samples for all the products they released. You can use this free loops:
quick and easy download!
Awesome for sound effects!
Use soundcloud to find and download loops for your music library!
342 free dubstep samples from musicradar!
and + 10.000 more samples from musicradar: http://www.musicradar.com/news/tech/10000-free-sample-downloads-235814