they dont sell them in store, you can buy a mobile connector online here: https://shop.tesla.com/us/en/product/vehicle-accessories/corded-mobile-connector.html and you can look for tesla reccomended electricians here: https://www.tesla.com/support/find-electrician
I don't see any reason to need a Tesla oriented electrician. Just a good one. Make sure you get the hardware first there are a number of different sockets. Check with your power company, mine had a program for electric cars and provided the charger. They might at least have a recommendation.
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