Stock Audio and Video

Here are some links to great websites that contain video, music and sound effects that you can use for free.  Some of them require attribution, so make sure you check the rules before you charge ahead.

Production Crate
Production Crate is an excellent resource that will have you compositing your own dystopian movie sets in no time.  They have lots of images, videos, compositing elements, sound effects, video effects resources and more.