I'm getting tired of lugging a power cord from my office to the couch to my study to the coffee shop to a friends house, etc, and having to crawl under numerous desks and such to plug it in/unplug it around home/work. I would rather just buy 2 more power cords, so I at least don't have to deal with it at my stationary workspaces. However, the cords are going to run well over $100 from Apple/Amazon/Best Buy, whereas eBay seems to have some for a paltry ~$15 each. So - are the ebay ones safe? Or should they generally be avoided? Thanks in advance On a side note - can the new MBA's use the same power cord as the late 2009 MB's?