It's not available on the website. You have to either go through a dealership to special order one, or I've heard of people having success with ordering a SR+ on the website then calling and having them change to an SR.

Has anyone been able to get the Tesla standard range? Less range than the standard range plus (220 vs. 260) and not available for order on the Internet? This is the mythical $35k Tesla and I'm curious as to whether anyone local has been successful in purchasing one.