I bought mine on Ebay and had a local stereo shop installed it for under $150 in less than 1.5 hr.
http://cgi.ebay.com/NEW-PAIR-HEADREST-9-LCD-CAR-MONITOR-2-DVD-PLAYER-USB_W0QQitemZ220573293305QQcategoryZ48608QQcmdZViewItemQQ_trksidZp3907.m263QQ_trkparmsZalgo%3DSIC%26itu%3DUCI%252BIA%252BUA%252BFICS%252BUFI%252BDDSIC%26otn%3D8%26pmod%3D220573301647%26po%3DLVI%26ps%3D63%26clkid%3D5681814959012223948
http://www.sunvalleystereo.com/