$650 for a door actuator?

[youry]

to make a long story short, I took my car to the dealer becuase my passenger door won't open. not from remote, from inside, from outside. Once every other day it works out of the blue. I just got a call from the service dep and they say that the door actuator is weak and it must be replaced. $650. is that the going rate for a job like this? Geez..I cannot imagine having an engine problem. I should probably rob a bank to pay the bill. What should I do? And the guy says that I might need even more parts.