I was browsing my local Craigslist advertisements last night when I came upon an advertisement for a Rev. C MacBook Air listed for $1300. I contacted the seller, and inquired about the unit. The seller advised me that the reason it was priced so low is due to the fact that the unit has no warranty. He claims that he purchased it from Best Buy as a "returned unit" and so it came with no warranty. He has provided me with the serial number for the machine - I plugged it into apple's warranty website, and it does come back as having an "expired" warranty. I am a little confused how a unit released in June 2009 could already have an "expired" warranty - but I guess if it was a returned unit, maybe that is how Apple does it? The price is intriguing but I have great reservations about purchasing a used laptop with no warranty, when it could still have a warranty. Any thoughts?