It is possible, but you run a major risk that the other party changes their mind or "forgets" once your end of the deal is done. I've got a buyer from Craigslist right now that is mailing me the payment on some vintage flatware because we're about six hours apart. They don't know me from Adam. I'm honest and will of course mail them their package, but I'm a little surprised at how fine they were with sending me money and never at least speaking to me on the phone first. Not with something like CL with it's no accountability anyways.