I used to tint windows for a living.we would say about 50-60 for removal on 2 door car.but really, we would determine the price when we saw the car or truck.. the times we would usually charge more is when a big van or mini van comes in that has a lot of glass.
as for removal tips...go get yourself a nice large pack of razor blades, ammonia(you can consentrate it in a spray bottle with more water than ammonia).. remember...this stuff will tear up your nose and eyes while using it.
we had a steamer that is really the best way.... hold steam on the tint for a minute or so andjust peel away.....depending on how bad it is.. it may take more effort.but I would take off a large amount of tint (as possible) and then spray it down with the glue remover we had (worked awesome...not sure on the manufactor, but we got it through our tint supply catalog) and just scrape away with the razors.
its no easy task, unless the tint is brand new..even then.
so when you go get an estimate from a tint shop for removal..don't think that they are charging you way too much and just trying to **** you over..myself... I would rather not remove the tint than get paid the removal charge.
goodluck
-Dan