Window tinting

[marmite_on_toast]

It's been years since I chaved up a car, but I'm after a bit of advice about tinting the rear windows of my as sportback.

Just need to know what to look out for, are there cheapo crap jobbies and how much (roughly) would I be looking to pay for the job?

Any help would be great.

 

[MarkSport]

At Portugal you pay 25 €uros for each window, professional service.