I got mine from Amazon. Schrader 20028 for $36.57 each with free shipping. When I got new tires put on they replaced the sensors. I went to the dealer they said it would be $45 to set them. I had other work done at the same time so they didn't charge me to set them. It took about a minute to set them. There OBD III and MB adapter and a magnet is all they needed.