Losing your car keys can be a very big problem. Replacing them can be very expensive if one of the keys you need to replace is the kind of new sophisticated microchipped remote control device that is now common with new models. You have three alternatives for replacing your keys: your car dealer, a locksmith or a vendor mail-order car-key. The last two options are cheaper than first one.
Car dealer
The car dealer from which you bought car, can replace the ignition key and entry key or keyless entry remote.
They simply need the VIN (Vehicle Identification Number) and your documentation for the car to confirm that you purchased
vehicle from them. Dealers often charge a steep price however, anywhere between $150 to $350 to replace a
remote control device. So going to the dealer should not be your first solution, unless your need is urgent and no
alternative is already available.

In case to avoid the cost of an expensive key replacement from your car dealer, make a consulting with a locksmith.
An ordinary key may be replaceable for a couple of dollars. Many locksmiths can make a keyless remote for you,
in which case the fee is likely to be tens of dollars rather than hundreds of dollars.
The locksmith will need the VIN to
cut a correct key or make a keyless remote. (Since the VIN number can be used to obtain a copy of your remote,
it is a good idea to keep it hidden with a bit of tape to help thwart thieves).