Bosch unit on Amazon goes for $35 shipped (2 days to your door with Prime!)

For future reference, if someone is looking for a replacement alternator to swap-in when something goes wrong with theirs, I've got one on its way back to me fresh rebuild. Was new old stock and only in the car for ~2 hours before the regulator gave up the magic smoke. Yours for way less than Audi's $974 list price (of which they have 0 in stock in the US as of typing this up)

O_E