Tinting the rear windows is fine, its tinting the front that could get you in trouble. Knock on wood, i still havent gotten in shit for it. Like i said, if you dont act like a retard on the streets and dont bring attention to yourself you will be fine. My buddy with a SS/TC went a few years with 5% all around and never got botherd. He got caught street racing, then got caught a few more times speeding and now the cops always harrass him about the tint. He went from 5% in the front to 35% front...still got nailed, now he is taking it off. But yet, i can drive next to cops all day long and they dont care about my car.
And yes $450 is way to much. I got my Rear Window, the small side windows in the rear and the 4 doors done (7 windows total) for $220