From dealer a new 3rd brake light is $360 but the light is out of stock. If yours' is not working you can get it fixed by going to www.ledfix.com
. I shipped mine in a tube from UPS and included a return label. With the tube the total for shipping is about $45. That was from Richmond KY to shop near Nashville TN. You will need to contact the shop for price of fix and that may depend on what's wrong inside the light. The shop goes in through the back of the light, the side under the spoiler on a convertible, and then they patch the plastic which doesn't look bad.