Hi Mako,
I work at rolls royce and with any car factory dents are innevitable... so we have specialists called spanglers, who use a series of rods hammers and other PDR (paintless dent removal) tools.
All a PDR guy will need is the inner trim panel removed from the interior and they can then get in and remove the dent.
I had a small dent caused by a stone on my bonnet taken out by my friend and luckily it didn't cost me a penny, but it would have only cost about £30...
Price just depends on the size.
Hope this helps.