 On July 29, 2015, Tesla announced a referral program though October 31, 2015 wherein owners of a Model S who refer 10 new buyers gain the option to buy a Founder Series Model X for the price of a base model.The first person (in each of three regions; Americas, Europe, Asia-Pacific) to reach this 10 referral point would be given this model for free.On July 13, 2016, Tesla introduced its Model X 60D, which is slightly lower priced than the Model X's starting price.