2009.1 is the latest map disk from Navteq. However, it has been out for over 6 months. So, there is a decent possibility that Navteq could be releasing a 2009.2 version any day now. Yes, eBay is the cheapest place to get one.

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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