If the seller was selling a brand new iPad 2 on Craigslist at cost then it was probably hot (stolen).
Not necessarily. I bought one at cost off Craigslist (after researching the seller on Google). She was a nice girl, selling it because her boyfriend didn't want it - he wanted a Xoom. Made for an awkward sale though, he came along and was putting down the iPad. I told him how we use it at work for showing product MOA videos and by the end I had him actually wishing he'd kept it. Pwned.
To the topic at hand, all stores in the Philly area are sold out. Best Buy in KoP added an automated "We do not know when we will be getting more iPad 2s in." to their answering message.