Hope it is usual dealer gouging that you are running into and that the problem isn't that bad. Unless your car has massive miles or has really been flogged, I'd be a bit surprised if it had what they say. But you never know.
Anyway, I on the off chance that you can get the light off in order to sell it, I would invest the $200 and a six of beer in replacing these three things:
Crankcase vent valves
All three of these are really easy to do, and if they get the emissions light to go off, this will add much more to the value of your car when you sell it than the $200 invested in parts. There are good DIYs for all of these chores and I'd guess you are looking at about 2 hours of time once you have the parts.