Believe it or not, it costs nearly $2,000 for Tesla to sell a 2015 Tesla Model S out of any one of its showrooms. Online sales inevitably come at a much lower price, so Tesla has decided to pass on the savings from online sales on to its customers through an experimental referral program. Current Model S owners can hand out a referral link to any of their friends. If a sale is generated through the link, the current owner and new customer get a $1,000 credit toward a new Model S. If the current owner isn’t looking to purchase a new Model S, he can use the credit toward service or accessories for the one he already owns. So, what if you have more than one friend interested in buying a Tesla? Well, if you have five or 10, the incentives get even better.