Yup, definitely a common scam.
For a while it was always Bambis and always at the same price point, I got in the habit of flagging their ads with barely even a cursory review. They've started changing up a bit, both in the price and advertising the smaller Safaris from time to time, but the story is always very similar. I think the ones who are impersonating military families and/or personnel should be beaten, but then again I'm from a state where it's generally acceptable to shoot cattle rustlers, so my attitudes may be a bit extreme.
As to having their email addresses... you have either addresses they set up specifically to run these scams or addresses they've appropriated from real people who aren't careful enough with their passwords, I'd be willing to bet you a mortgage payment that the email addresses themselves would be a dead end. *IF* law enforcement were sufficiently motivated, the IP addresses from which the craigslist ads are posted and the emails are sent would be a start, but it's nonviolent crime with a small dollar figure (small in criminal terms, no doubt not small to people who are duped by these dirtbags!) so the agencies with appropriate jurisdiction aren't going to be particularly interested.