shop by me wanted over a 100 for just the back window, i got a pre cut 20% off ebay and installed it myself, for 15 bucks. they sell tint for evey window of the car for about 50. any % you want. items in Precision Window Films Automotive Precut Window Tint Kits store on eBay!
and there is a difference between 20 and 35. 20% is darker, im running 20 on the rears and 35 up front. 5% brow that cost 5 bucks iirc.
if your friend has a heat gun it should be ok to try yourself. you need to shrink it to the outside and then put it on the inside.
this is the place i used, the tint is more than ok, its not really pre cut, but it does have perforated holes to cut along. ships in a thick cardboard tube with in days to your door.
this place is a tint shop and this is what they install on customers cars.
