2002 Driver's Side Lock Actuator

Does anyone know the part number for a 2002 driver's side lock actuator? Mine has been broken for over a year and I haven't gotten anywhere with Toyota about fixing it. I've lived with it for a while, but am getting sick of it and accidentally leaving my car unlocked. The dealer wants a few hundred for it, but I'm pretty sure I can get one for cheaper. I did a Google search and didn't find a specific part number. Thanks.