https://www.tesla.com/blog/update-our-vehicle-lineup
"Given the popularity of the Standard Plus relative to the Standard, we have made the decision to simplify our production operations to better optimize cost, minimize complexity and streamline operations. As a result, Model 3 Standard will now be a software-limited version of the Standard Plus, and we are taking it off the online ordering menu, which just means that to get it, customers will need to call us or visit any one of the several hundred Tesla stores. Deliveries of Model 3 Standard will begin this weekend."