Hi Tulip999,
You do have a dealer in your area that specializes in the 450 model you own. Contact Tim Day at 602-318-4211. Tim is one of two or three dealers in the country that can also replace a 450 key if you ever require one. Key replacements are not cheap, but Tim should be able to meet that need. Tell him I told you to call. If you can't find him there, or if you have questions that he can't answer, let me know. I'll provide you resources and websites to take care of nearly every problem you may have. There are 1026 of these converted Mercedes engine smart cars in this country and there are folks who are very intelligent in the troubleshooting and general assistance areas. Enjoy your littler (by 7") smart car!
Ron Gaus, aSmartCar.com, St. Louis