http://www.thepornbaron.com/cartoons.php
Maybe if you describe what you are looking for i can find some time to help, i'm not even looking for compensation. Practice, make a new friend in the process
and maybe even earn some good karma. Though i can't promise vector, that would take longer depending on simplicity/ colors etc. If you're not in a rush drop me a message or email.
I think you should explain your idea, then get some artists posting some sketches up. Make it a bidding war. Simple sketch should only take an hour, but you'll get a good feel of their style. Seems like artists push their talents but i guess they don't need the work.