Youtube does have a few good ones. Some have a guy with a very creepy voice! I looked some up for a friend a while back. There are also websites specifically archiving many. Google "guided meditation" and a bunch should come up for you.
I personally enjoy writing my own. If there is something in particular you wish to achieve, I suggest doing so too.
However mantras and mandalas make great focus tools for meditation if you just want to improve your experience when meditating. I like to pull myself into the mandala through visualization. Each one can produce a different experience, so experiment with different ones until you find one you really enjoy.