It was a colossal pain in the ass to purchase an ESA these past few weeks. A few weeks ago, the form was present to enter contact and credit card info from the /support/[e-s-a] page. This week, it was gone. Wasn't just me - the phone support rep couldn't find it either and fortunately knew what I was talking about. Unlike the next two contacts. This after a local SvC said the best route was to call the 800#. Well, subsequent calls to the 800# and any attempts to reach an SvC via phone resulted either in no answer or no clue, including bad info.
Finally, I called Sales, who, go figure, answered, gave initially bad info, and then transferred me to a random human at a random SvC. All of this after the initial support ticket resulted in "You'll have to purchase through a SvC." See above when a local SvC said to purchase via phone support.
Anyway, the random human, after trying to find reasons to not take my money, finally acquiesced, took the payment via credit card, sent me an invoice for the ESA, and stated that my Tesla account online would reflect the ESA purchase and date thereof. Helpful since ESAs are transferrable and refundable (pro-rated in favor of Tesla, whether more mileage or more time elapsed, less the retail cost of any repairs performed under the ESA).
In other words, if you drive 25K miles/year, it's another $200/month and $200/visit with no annual service requirements anymore for 24 months of relative peace of mind. Unless you're smart like I was not and remember to purchase the ESA which is no longer available for purchase unless you're grandfathered, evidently, for $4250 instead of $4750 for the 50,000 additional miles of coverage. The 4 year thing is a joke - anyone who drives one of these chariots less than 12,500 miles/year has completely missed the point of owning one of the finest touring machines on the planet.
While annual services are no longer a thing, do consider brake fluid flushes every 25K miles as well as AC dessicant bag and refrigerant topoff service every 50K miles. Neither of which are covered by the ESA, but still - it's inexpensive preventative maintenance.