I do not like to just throw off my skill, a million do it, I first of all share what I use. Today these are two libraries (bitch, expensive).
In one I found samples from movies, a very interesting selection.
In the second I cut 808 bass.
There are both drums and instrumental loops in them.
- Hypnotic Trapsoul
- Son of Grindhouse
I got a track in the form of a sample, you'll have something else.)