If you're considering a used MacBook (or iPod, or any other Apple product), you might do well to check out eBay, which apparently has it's very own Apple-run refurb store. 9to5 Mac reports that the store, named only as "Refurbished Outlet," is a trial run by Apple and the products offered come with all kinds of perks you wouldn't get buying from a private seller. These include a one year warranty, a fresh battery in iPads/iPods, a re-install of the original OS, repackaging complete with manual and cable, like-new condition, complete burn-in testing, and a final quality inspection by Apple. The prices match refurbished models sold through Apple's own website.
Though Apple has not confirmed that the store is run by Cupertino, 9to5 Mac seems to have gotten confirmation from someone, noting only that nobody on eBay would go on the record with a confirmation. The site noticed the store a few weeks back and has been speculating about its existence ever since. They believe it's an experiment so there's no telling how long it will last, or if it will lead to bigger and better things. For now, head on over to the store and check out what's on offer for yourself (opens in new tab).