See previous post.
Anyone buying a new Tesla can get free supercharging and a $1000 credit towards a new Model S or Model X by using this referral code. This code is valid for orders placed between May 19, 2017 and the end of 2017. Tesla updates their referral offers quite regularly. The referral code here seems to work for all of them. As of this update (February 2018), the first person to use my code gets a $500 credit, and the first five people get unlimited free supercharging.
And, yes, I think my Model S is terrific!