i think this is the site I fund my break samples
http://www.thesample.net/category/samples/A lot of good breaks there,classic funk breaks and stuff ,i have all the hiphop all the classic breaks serie and rare hiphop breaks packs and they are great!
but I would suggest to you to try to make your own,with something like addictive drums and samples,its a lot more rewarding,you have more control and the break will sound more unique.
