Royalty Free Video
After Effects Projects and Loops
Over 3,000 Royalty Free video files from $1. Other sites for the company include ActiveDen.net AudioJungle.net Themeforest.net GraphicRiver.net 3docean.net and codecanyon.net
iStockPhoto
Search our royalty free stock images and photos or browse a giant selection of stock photography. They also have some video clips as well as photos.
Free Stock Footage
Broadcast quality stock footage, royalty free B-Roll. Add stock footage to your video, website or your Powerpoint presentations. This stock footage is great for using in either Final Cut Pro, iMovie, Premier, Media 100, Avid or any non-linear editing system.
Thought Equity
Some seriously high-quality footage including stock footage in HD from companies like Sony, National Geographic, MGM, NBC, HBO, Marvel Entertainment and more.
Shutterstock Footage
With top quality video material, a user-friendly interface, and an affordable cost structure. Prices start at $10 per clip.
ArtBeats
Quality HD stock footage shot on film and video with the largest selection of royalty free clips available.
Royalty Free HD
Expensive, high-definition stock footage. All are high quality and professionally made but prices start at $149 per piece. Include collections of pieces for $699.
Pond5
The world's first open marketplace for stock video footage, and it's a better way for video professionals to buy or sell stock footage for use in productions.
GotFootage
Flat Rate Pricing * Immediate Downloads for All Orders * Footage Includes All Rights for All Media, WorldWide, and In Perpetuity. Flat Rate Pricing of $50 per clip Other sites include - Wrightwood.com FootageHouse.com GotHiDef.com FootageHouseHD.com All clips are 720x486 29.97fps Quicktime/Photo-JPEG
Action Backs
I included this place because it's got some great animated backgrounds that you could then throw whatever you needed on top of.
Always HD
built to provide professional Cinematographers and 3D Animators with a means to market their footage; actively seeking out camera operators, studios, and artists whose work will be of benefit to video producers around the world by focusing exclusively on the sale of High Definition (and emerging 2K / 4K formats).
Animation Factory
Another place specializing in background animations with hundreds of thousands of pieces.
Wrightwood Laboratories
If you need outer space then you need these guys. Part of the GotFootage network but man have they got space footage.
Ocean Footage
If you are looking for something closer to home then this is the place to search. All sorts of oceanic footage.
After a while I just started running into the same sites again and again, either with other domains pointing to them or the same content with a different wrapper. I also ran into the Wikipedia Page on Public Domain Image Resources which has a massive listing of, well, just about everything.
http://commons.wikimedia.org/wiki/Category:Videos_by_subject