I noticed the same thing. When I bought the car (Nov 2018) and several months after that, the Extended Service Agreement (ESA) link was available. Recently, however, the link only returns me to my home page. I believe the catch line was in the description "within the eligible purchase period". I believe we had a limited time after delivery (possibly 90 days) to purchase the ESA via the website. I do recall having the opportunity to purchase varying years of ESA. Since my car already has one, I chose not to. And now that Tesla's don't really need yearly service, I'm glad I didn't buy in to it. Not that you asked for additional info, but I've done a fairly decent job at getting Tesla SC to repair any and all factory defective components; from new floor mats due to "failed" hook and loop to weatherstripping and taillights due to condensation. Heck, I just received a new "refurbished" P85 batttery pack (Rev D). If it's a factory defect, I get it fixed. As for fluids, wipers, and filters, will just play it by ear on my CPO T-MS.