Broken side mirror unit

I have a 2003 Mitsubishi Galant that the side mirror has been broken off of. This is the entire unit; it's not completely detached, it's still hanging by whatever wire connects it. What I am wondering is, how much can I expect to be charged for a repait such as this? It's the holidays and I can't afford to be ripped off now more than any other time! Doing it myself is not an option, I don't have the skill or the patience (just being honest). I'd appreciate any advice. Thank you!