New and replacement cigarrette lighter units are available at any auto parts
or discount store. I just got one for my '01 A6 for $5.49 at Meijer
I've found that the recent Audi lighter socket is the smaller "accessory"
socket rather than the standard (larger) lighter socket. Since most of my
accessories require the larger socket (e.g. cell phone charger), I wondering
if anyone knows of an adapter/converter to change the socket size. They both
appear to be 12 volts, so it should be simple mechanical adapter.