[Sid 6.7]

I paid $200 for mine.

Depending mostly on locality, price can very mildly. In Los Angeles, where competition is huge, you might pay between $130-$180 for the same quality job that in a smaller market may cost from $200-$300. It's the number and shape of the windows that make the most impact on price, besides quality of tint. Huge compound curved windows (such as the rear windshield on an F-body) will cost more that smaller flat glass. Honestly, how dark the window tint is, has no bearing on price. Some shops though will want to raise the price for darker tint.

My advice, call around to the best shops in town and take an average. And at most places, price is negotiable depending on time of year (winter time you can get a good price since fewer people are getting it done), number of vehicles (package deals for multiple cars), and other services (maybe you get an alarm installed as well, or a pinstripe, or another add-on they offer).