Well up here it isn't Ziebart anymore it's Ztech but when I was getting quotes for both my remote start system and my tint their prices were way higher than other peoples. The place wanted 300 bucks for it. I ended up going to a place where he use to work for Ztech but started his own business and only charges per window. I do believe that most places just charge per window because tint is tint. Doesn't cost more to buy the 35% tint than 50% tint.