Envato is a company that has created websites (which they term "marketplaces") for every type of creative professional. They have over a million members on their marketplaces. The two sites that I use most often are VideoHive.com for footage and After Effects templates, and AudioJungle.com for music cuts. Their prices are among the lowest for the quality they offer. Each month they send out an Envato newsletter that includes eight or ten free downloads from their various sites. Check it out.