depending on who does it and where you are located.
i live in south orange county, so everything is way too much money, but oh well.
they charged me somthing like 50-75 for removal of all windows.
they tinted all windows and gave me a lifetime(as long as you own the car) warrenty saying that it will not bubble, lose color,ect. it shouldnt matter what tint percentage you want. i got the california legal (pretty much nothing) for the front sides...then 20 on back sides and back window(which is still legal since its not the front sides)
4 door will always be more than a 2 door.
all together i believe they charged me some where around 250 or so.
I love my new tint. my older tint was pretty much about to turn purple.
make sure you get a warrenty though, you dont want crappy tint. the shop i went to used llumar, which has a good reputation.
call a few places and get price quotes and ask them a few questions.
edit:... also, if you have thoughts about what tint percentages to get, dark interior will make the tint look darker. light interior(such as tan) will reflect more light back too you, making the tint look like its blocking less light. i recommend getting either 20-35 for a not too rice, but nice darkened color. i think 20 is really nice for a tan interior, but 35 is nice for black interior... just MY OPINION... not yours.
edit 2:... if you have any more questions.. just ask. i should be able to help you with this subject. if not me, i am sure someone else could help you.