Steering Wheel Audio Controls

I got a 2008 TRD Off Road package taco about a month and a half ago. My truck doesn't have the audio package with the steering wheel audio controls but I am wondering if you can add just the steering wheel controls and if anyone has done this. Or do you have to get the entire audio upgrade package. Also if anyone has added the steering wheel controls if you could fill me in on a ballpark price range too, I'd assume that the dealership would be really expensive for it so if you took it to a car audio place let me know that too. Thanks.

 

if it didnt come with it from the dealer i wouldnt bother. going to cost way more then its worth if you try to add it yourself IMO.