FWIW, my best quote was from Progressive. I don't have the figure in front of me, but it was roughly $480 for the first six months, but that included a first-month new-customer discount, so it would go up a bit after that, to just over $500 for the second six months. This was significantly better than the insurance company that insures my Chevy Volt (Geico), which quoted me $1171 per six months for the Tesla. (I'm currently awaiting delivery of my Tesla.) I got other estimates, too. Most were in the $600-$800 per six month range, IIRC; but one or two were pricier than Geico. I was surprised that Geico was so costly; when I switched to them a few years ago, they had the best rate for my car at the time.
As others have said, of course, many factors other than the car can have huge effects on insurance rates, so take the above more as guidance on what companies might be worth looking into, not what you might end up paying.