We just got word from Tesla that they don't want us to sell any more ECU's so this means you will need to purchase this from a Tesla Service Center.  There are reports of many successes in getting Gen4 ECU from Tesla.  You will need to be assertive and insist that since this is a non-restrictive part and you would like to purchase one.
 
We want to thank Tesla for the support that we received in providing this service to the Tesla community.  It's been a good run but it must come to an end.
 
We will still have "A Bundle of Wires with A Board" available.