First, Never ask about downloading, i'ts against the rules and the #1 unforgiveable sin here.
Second, if you have a dvd drive you can rip your own dvds, just check the guides.
http://www.animemusicvideos.org/guides/ and check the forum stickies and the hundreds of other posts asking this. you will find most of what you need there. It's a lot to read but it will really help you.