I would just buy the entire Actuator instead of the little motor alone. Seems that few things can go wrong when taking the actuator apart and putting it back together.
I replaced my entire actuator that I got on ebay for $23 and everything was done in 40 minutes. Link for actuator below.
New Front Door Lock Actuator with Latch Right Passenger for Lexus Scion Toyota | eBay
Good Luck.