Reason I ask is because mine is a lease. If I got it installed at a dealer I won't have to pay someone to remove it when I turn in the car. I understand dealer probably charge more, but would like to get an idea of the price.

i asked to have the tint installed when i got my G - i bought it, not leased it. the dealer (Infiniti of Memphis, Tennessee) said they contract that stuff to a third-party shop, who did an awesome job the second time around - the first time they had some bubbles and ended up redoing the whole car. but yeah, it's doable. and i doubt the dealer will ask you to remove the tint if it's legal percentage (not too dark).