The Tesla Model S, is, despite the company's somewhat questionable practices, a brilliant car. It also happens to be electric.

It's also quite in demand. So what to do now that your Tesla [NSDQ:TSLA] Roadster has been superceded as the coolest production EV around?

Trade it in!

That's right, Tesla Motors will buy back your Roadster, giving you the cash you need to turn around and buy a Model S.

How much will you get for your Roadster? That depends on its condition and equipment, of course, but Tesla is seeking to resell the cars for $70,000 to $90,000, so you can likely expect something like two-thirds to three-quarters of that.

At the upper end, that works out to about enough to buy a 60 kWh Model S ($69,900), or get most of the way toward the 85 kWh Model S Performance ($94,900) you know you really want.

Perhaps most interesting about this program, however, is that it's newsworthy at all. A carmaker taking old models as trade-ins on new ones? What kind of sorcery is this?!?

You can now trade in your Tesla Roadster for a Model S

You can now trade in your Tesla Roadster for a Model S