I suggest ebay. I just got mine and at a good price from:
http://www.ebay.com/usr/premiercarstereo?_trksid=p3984.m1439.l2754
Fast shipping and best offer, so, start low until your offer is accepted.
http://www.ebay.com/itm/NEW-PIONEER-AVIC-8000NEX-DOUBLE-DIN-7-TOUCHSCREEN-NAVI-MP3-CD-DVD-BLUETOOTH-/181366098638?pt=Car_Audio_In_Dash_Receivers&hash=item2a3a430ace