Well, I hit my local Best Buy and they told me that you can get an Alpine but would have to pay for an adapter which ran about $130. But they didn't sell Alpine and to try Sound Advice. I went over to Sound Advice and they checked their computers and the Alpines are apparently only compatible with the 330's that don't have a NAV system. So, basically they said that I had to buy the dealer one.
Obviously, I'm not too interested in forking out that much money without investigating. Anyone else have for sure info on 2002 330Ci with NAV?