$390 is about the average price for a commodore sedan from tintacar.
octane is their darkest legal which used to be 35% all round.
now they offer 20% on the back doors and rear window and 35% on the front doors as legal, you can see the difference when you look at the side of the vehicle and imo it looks like crap.
most tint places will put what ever you want on, I always get 20% all round which is not legal but I have never had an issue with police over it.