It seems Costco is now including installation charge in the price.
I read something somewhere about this. I checked out the website and it seems to confirm it in all the banners. However, when you price out a tire set and add it to your cart it does show price for installation but it is not really clear that it is included.
Just for fun I priced out Pirelli - CINTURATO P7 ALL SEASON PLUS 2 for my former BMW size 205/55/16 at $657.96 installed. Seems like an excellent price.
Does not seem liked they have bumped up price of tires to compensate for this new inclusion. But I may be wrong.
UPDATE: I thought this was big news. I know Costco is popular with tire buyer here. I guess everyone was aware of this.