If you think you can go to any hardware store to have a new car key cut for a few bucks, you’re still living in the 20th century. Nowadays, when you lose a key or need an extra, you’ll probably have to go to a car dealer or automotive locksmith (or have them come to you) and pay anywhere from around $150 up to $500. And it probably won’t be for an old-school, bayonet-style metal key, either; instead, it will be an electronic fob that transmits radio signals to unlock doors and, on vehicles with “smart” keys and push-button start, enable starting the engine.