replace locks?

hey i need to get new locks on my car, the keyhole on the drivers side is completely missing, where the key should go theres just a hole, and the key doesnt work on the passenger side so i am forced to leave my car unlocked whenever im not in it. so my question is does anyone know about how much this should cost? or where could i get it done? i was thinking a dealership, they're power locks by the way if that makes a difference, thanks.

the dealership is about all i can think of since they can have KEYS made from you vin number. So i'm sure they can help out more than any other place about new locks. Getting new locks on your car is one reason why i tell people to watch out in getting new doors because of that problem.