It seems that it is impossible to get Yokohama tires from anywhere but Fisker dealers. Each tire (without the rim) goes for about 700 euros, which amounts to robbery in daylight to put it mildly. Similar tires used on Bentleys cost about third of that amount. However after researching the market, it seems that we have no choice but pay this amount. I would like to dedicate those funds to bigger budget for software programmers @Fisker.
Owner of 2012 Eco Sport Black, Prague