Looks like these folks might have a new one . . .
http://www.factorychryslerparts.com/...5135315AA.html
Or if you decided to settle for a used part look here:
http://www.ebay.com/itm/2005-CHRYSLER-CROSSFIRE-3-LEFT-DRIVER-DOOR-LOCK-LATCH-ACTUATOR-/231581099553?hash=item35eb4f2621&vxp=mtr
http://www.ebay.com/itm/2005-CHRYSLER-CROSSFIRE-SRT6-FRONT-LEFT-DRIVER-DOOR-LOCK-LATCH-ACTUATOR-/331542964484?hash=item4d31802904&vxp=mtr
Door Lock Front Left, used, CHRYSLER Crossfire Coupe/Roadster, 05099149AA, 1937230101