Tesla is a big fan of selling electric cars directly to the public (much to dealers' chagrin), and it's now doing the same for used vehicles. The automaker has opened an online pre-owned store where you can buy someone's former Model S at a relative discount. You're limited to shopping in a handful of cities in the US and Canada, but the cars come with a 4-year, 50,000-mile warranty to assuage fears that you've bought a lemon. No, the move doesn't make the company's luxury EVs much more attainable -- the best offer we've seen so far is for a $59,000 'entry' model. Even so, this beats having to scrounge through third-party websites and indie dealers in hopes of finding a rare bargain in eco-friendly transportation.