Write one yourself. You're a new startup? I wouldn't get too involved with formal legal policies. You can take a look at any website to get an idea of what issues you may want to address.

Copy paste. Nobody is going to sue you unless you get big. When you get some money flowing in, hire a lawyer.

Our start-up (i-conserve.com) looked around on the web, saw that most were partial copies of each other (as in, whole paragraphs verbatim), and decided to write our own, based on 4 or 5 we liked. We really liked the bare-bones approach most YC companies have, and tried to follow that philosophy when writing such legal documents.

Then we talked about to a local long-time entrepreneur, who said that is exactly what his lawyer did, and charged him thousands for it; in fact, it didn't turn out that great. So, save some money and write them yourself.