There's a listing for a 256GB SSD for MBA close to where I live, he's offering it for $200. It's not dirt cheap, but still it's fairly cheap. How do I test this out to see if it's not something faulty or fake? He also sent me a photo of it and it will fit into the MBA because it apparently came from an MBA. All my Craigslist dealings have been positive so far, never had trouble.