wanted to find out does anyone have a link to or know a seller..
i am sure it was probably an australian ebay auction that someone had up that had the 3rd brake light as leds with a circuit board that plugs into the fit/jazz 3rd brake light..
it was just a circuit board with lots of led that you remove the stock 3rd brake light red cover and put it in behind it close up and plug in and works..
i tried a search but cant find it.

 

You can do one yourself without spending too much. Check on the DIY forum to do your own LED 3rd brake light.

 

Not sure if this is what you're looking for:

LED Third Brake Light Replacement Board

Otherwise, if you're feeling up to it, here's my DIY.