My advice? Buy your used MBP from Amazon. I recently sold my MBP 15" on there and it was nabbed for 900 in about 2 hours. So you have to be quick. But, as a long time seller on amazon of audio gear and long time buyer of all things used I think it's much safer then Craigslist or Ebay. Furthermore, refunds are allowed if you find it was a bad machine and I feel like they vet sellers a bit more not to mention payment is handled through Amazon. Get it shipped expedited and request insurance so it's handled carefully.