Unless you really understand the mechanics of bicycles and their worth, I would stay away from craigslist.

You can get a good deal only if you really know what you are doing. 95 percent of the bikes on craigslist are being sold by flippers. Most are interested in one thing, profit. Many misrepresent and overprice their bikes. It is no place for a novice to buy a bike.

I have bought and sold hundreds of bikes on craigslist, but I stick to certain kinds of bikes that I have a great understanding of, others I keep away from cause I will end up getting burned.