A few months ago, I purchased a piano on Craiglist. It's been almost three months now and the piano still works, so it is appropriate to share my story as evidence that Craigslist is a great way to make markets more free.
One day, I decided that I desired a piano. I went on Craiglist for about half an hour or so while at work and e-mailed various people about seeing their pianos, digital and otherwise. Towards the end of my search, I struck gold. Some guy was selling a Yamaha PF-80 digital piano with weighted keys and a sustain pedal for $300. This is a total steal, as the internet reports that used ones have sold for as high as $1500.
The piano acquisition story is as follows: I e-mailed the guy, we arranged a time for me to view the piano, and we arrived at the guy's apartment to discover that he had been using the thing as a TV stand. Apparently, he had a roommate who went to Berklee school of music who left the piano with him. The guy wouldn't take checks, so we drove to the bank and performed an exchange of cash for piano. The piano was incredibly dusty and required some cleaning before we could move it. It now sits in my apartment under a nice cover. It works fairly well except for the right speaker, which has been damaged some from the TV.