I picked up a pair from Metro Direct on Ebay for $44 delivered(used a Ebay coupon). The regular price is $59.99 w/ free shipping. Bulb worked great!!
http://cgi.ebay.com/ebaymotors/_Car-Truck-Parts-Accessories__D2R-HID-XENON-BULBS-BULB-PAIR-03-04-05-06-Lincoln-LS_W0QQitemZ360103602605QQadiZ2865QQadnZCarQ20Q26Q20TruckQ20PartsQ20Q26Q20AccessoriesQQcmdZViewItemQQptZMotors_Car_Truck_Parts_Accessories?hash=item360103602605&_trksid=p4506.c0.m245&_trkparms=72%3A543%7C65%3A12%7C39%3A1%7C240%3A1318
http://cgi.ebay.com/ebaymotors/_Car-Truck-Parts-Accessories__D2R-HID-XENON-BULBS-BULB-PAIR-03-04-05-06-Lincoln-LS_W0QQitemZ360103602605QQadiZ2865QQadnZCarQ20Q26Q20TruckQ20PartsQ20Q26Q20AccessoriesQQcmdZViewItemQQptZMotors_Car_Truck_Parts_Accessories?hash=item360103602605&_trksid=p4506.c0.m245&_trkparms=72%3A543%7C65%3A12%7C39%3A1%7C240%3A1318