A good friend of mine called me recently to ask what I knew about scams from online sales. He had placed an ad on CraigsList for something he was trying to sell and had asked for $150 for the item. He had received a call from a woman and she offered to send him a check for the item.
http://robertsiciliano.com/blog/2013/03/03/just-one-of-many-internet-scams/