Yes. Sources say that Autozone cuts spare keys. Alternatively, contact a local locksmith who can cut your key to match the ignition lock of your car.
When you purchase a new car, the dealer will provide you a tag with a key code on it needed to cut a new key. If you don't have this, get the VIN number and take this to the car dealer together with proof of ownership. They can then look up the key code and make a new key for you.
Car keys have gone high tech, and replacing one is no longer a quick, inexpensive trip to the hardware store. An electronics engineer found that out the hard way. Read more at ConsumerReports.org.