I just did my front brakes. Got the pads and rotors from Autozone. But my calipers were frozen so I had to track down the right casting for my 4runner. Advanced Auto had them and they were priced right with all of the caliper hardware included (pins, clips, etc..)
Just check around to see if your local store has calipers for your truck. Both of mine were frozen and I had to waste an hour or so tracking them down while my truck was taken apart. That way if you do end up needing them you know where to go and the job goes much quicker.