I have STS Ltd. coming to do my install on the 22nd, reasonably quoted compared to others I contacted from Tesla's recommended list. They are running 6/3 BX from my garage at front of house down into finished basement, through ceiling to panel at rear of house. Since I only have 100A service at home I can only fit a 40A breaker, but figured to oversize the wire for future proofing purposes. Quoted 1100+HST.
Will report back with how the install goes once it's completed.