Perhaps Google realized that deactivating Glass if Explorers sell or give it away is a tad draconian and as a result, has recently changed its policy. While it's still against Mountain View's terms of service to sell off its futuristic eyewear, the amended Glass FAQ reveals that the company doesn't plan on "disabling any Explorer's device" anymore. However, since owners aren't explicitly allowed to sell, you likely won't find one listed on eBay, and chances are any attempt will be pulled down in a jiffy. Of course, if you can't find a second-hand unit and don't have a Glass-owning pal, guess what? You can always purchase an invite on Craigslist -- just keep your scam radar set to high.