Wow. I saw like 10 ppl answer and none of them really come close to informed guesses.
Roofs are estimated on a per square basis. A "square" is 100 square feet. I am assuming that the Tesla roof tiles are tempered plate glass so I am assuming from a material standpoint the price would be comparable, but considering the volume and size of each piece I think it's likely lower.
On alibaba that's between 4 and 18 dollars a square foot. Suggesting 4 per square foot is doable if you buy in volume. So let's just call it 6 for the extra coating.
6/square ft times 100 square ft per "square" is 600 dollars of material per square.
Roofers are typically paid about 120 per square in my region. This seems like it would be more labor intensive than a typical asphalt roof so let's call it 240 a square.
That comes to about 840 a square before solar panels.
Solar has already proving to be cost effective on ROI so the additional cost doesn't seem like a hard sell.
So the cost of the non cash saving part of the roof could be ~840 per 'square'. That's between 50-100% more than the average roof that should last 20-30 years. These roofs last 5x as long allegedly. All in it seems like a good deal IMO. And I think I'm estimating on the high side.
tempered glass cost per square foot-Source quality tempered glass cost per square foot from Global tempered glass cost per square foot suppliers and tempered glass cost per square foot manufactures on m.alibaba.com