How Much Does Car Key Replacement Cost Cost? Losing your car keys is frustrating and expensive. The cost of replacing keys is contingent on the type of key and the place where you purchase it. Locksmiths are usually able to copy traditional keys for less than $10. However, the majority of modern automobiles use transponder chip technology that need to be programmed by the dealership. Keys cut with lasers and blades are more expensive and require an appointment with the dealer. ...