leo
Google image search

Losy
looks like a pretty good site! I don't know about the basketball one, but there were other sports ones! this site has an animated one of bugs bunny playing basketball! If that doesn't help, google it.

Vogon Poet
Here are a few:

John K
Be vary careful what you do with any clipart you find. There are such things as copyrights and if you violate them, you could be in for a very big problem. The major studios are VERY protective of their cartoon characters and if you want to use one you must firat ask permission. If you don't, you could find yourself in court answering to a law suit for copyright violation. That can be VERY expensive for you.