If you can’t order your Tesla Model 3 yet, how can you pick up a used Model S (or X) instead?

Tesla Model 3 teaser image with Model S and Model X, March 2016Among the hundreds of thousands of potential buyers on the waiting list for the Tesla Model 3, many are waiting for configurations that aren't yet available—all-wheel drive or the more affordable small battery pack. And many of those probably won't be able to wait. People buy new cars for all kinds of reasons, most pressingly accidents...