Although it's well known dealerships love price gouging customers, I just wanted to add my most recent experience. I have a 2004 TSX, about a month ago the front driver side actuator stopped working (the remote door lock/unlock). I was able to procure the part myself (OEM Honda Part).
I called the dealership and asked for an installation quote, they responded with $250.00 plus tax.
I then contacted Cam's Auto (about 2km away) and got them to install the part. Cam's charged me $150.00 including tax.
If you're outside warranty, avoid dealerships at all costs!.