If you are looking to get a quick fix from one of your favorite Disney movies, one place you can find some clips (and trailers) is www.wingclips.com.
Initially designed as a site where churches and religious groups can access material to be used for sermons and inspirational talks, this site allows you to view clips free of charge.
If you want to download them, you need to subscribe to the site.

Here is a sample of what they have available: