Maybe it's a Midwest thing, but I still believe that shaking someone's hand on a deal is as good as a contract. Even if that handshake is over the phone on in an e-mail. For that reason, I don't require a contract for most of my Summer Reading Program Library Magic Shows. However... If a library doesn't know me and would feel more comfortable with a contract, I am more than happy to draw something up and either mail it or e-mail it to them. The same holds true for invoices