Granted my plug is next to my panel (three feet of cable) but received four quotes:
Two electricians I found via Tesla.com - $1500, $1850
Two I found independently: $275, $325 (told them it was for an EV, not for a Tesla)
Yeah, that's pretty much true with MANY things. I got some quotes from Tesla.com for installing a HWPC and and or a 14-50 near my panel. Certainly, the tesla.com provided electricians were MUCH higher than anyone else. Even the 14-50 to power the HWPC (so not hard wiring it) was higher than any other.
The funny thing was that ONE of the tesla.com provided electricians gave me one quote and then I am near certain that when I contacted them directly and said "I'd like to just install a 14-50 for my company supplied BOLT", I got a price that was 225$ lower than the same quote for the 14-50 install from the tesla.com provided electrician quote. In our area, Bay Area, pricing is pretty high regardless, but I found an electrician locally who said he'd put in a 14-50 and upgrade the break and put it within 3ft of the main breaker panel for 250$, so that sounded pretty good to me.