just a suggestion from my computer modifying days, if you're the DIY type... we use the same ccfls in computer cases as are used for the angel eyes, just not circular. get white ones, go to a place that specializes in movie camera equipment, buy some colored filter, and wrap it around the light. if the filter isnt flexible enough, there is this spray thats for like stained glass. both work, but neither will be exactly amber.
and no i dont know where you can buy amber ones.