New key fob’s and transponder keys made for less - Sima's Locksmith - Brooklyn NY No matter the reason, if you want an addition set of keys or your old key is broken, we can make a transponder key for you, for a lot less than you have been led to believe. We have the tools, the programmable keys and the expertise to save you hundreds of dollars. We think it’s a shame how expensive transponder keys are when purchased from a new car dealer. We are committed to saving you big. We offer replacement transponder keys for all major makes, models and years.