eBay for the best price, or www.bimmernav.com for known quality and support.

Shop carefully on eBay, and you can get one for $750 or better. Just make sure that it is a true MKIV and not a nav computer from an E65/E66 that is incorrectly called a MKIV. There is a good nav computer buyer's guide on the Bimmerboard Nav forum.

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SOLD
2000 E38 750iL Highline Edition, Upgraded with the lastest 2006 X5 Electronics
MKIV Navigation, 16:9 Display, Bluetooth, TV/Video with Backup Camera, Sirius, and Aux Input