Just remember that it is illegal to have windows tinted. It is fine if the vehicle comes with tinted windows when purchasing. You would have to check with your insurance company if you can do this. I read about this somewhere but I can't think where.
Ford Modeo type car should cost about EUR260 + VAT, and a Renault Scenic should cost about EUR320 + VAT. Windows can be tinted with a tint up to 35% opacity and still be within the law.
Have a brother in law that does this work – his email is atint@eircom.net