1999 mercedes SL 500 where is the cheapest place to get an extra TRANSPONDER key please

Check the internet for locations in your area.

I did try that but not finding anything other than the Mercedes Dealer(need KEY and TRANSPONDER)

When you drive a 500 be prepared to pay through the nose! A Toyota it ain't!

Mine is in showroom condition(60,000 mi)

BAD NEWS! The key on a Mercedes is a special cut that unless you live in a city of a million plus probably doesn't have a lock smith that can cut & program one. This style key can only be cut by an M-B dealer. It is a special machine to cut it. There may be some lock smiths in big cities that can cut it but be careful. They may be able to cut it but not program it. My key was $135 at my dealer and he did two for $200 for me. My advice... Bite the Bullet.

Thank you

Dealer is basically it if you want it done right Little pricey but You can try a local locksmith that does autos If they have the proper key cutter