How do you get replacement keys for your 97 Maxima?

On many cars you can go to the dealer and he can cut you a key by your giving him the VIN on your car. I assume you have lost your key and don't have one to get a copy made of. Of coure, you can always have a locksmith make you a key from another lock on your car that uses the same key as the ignition. This is what I would do if I didn't have a key to get a copy made of. I think it would be much more economical to have a key made rather than replacing all of the locks on your car.