Tirerack has them for $65 each.
If you run more than one set of wheels for your Tesla. you might consider getting the Autel universal 433Mz sensors for $23 each on Amazon. You would also need to buy the Autel hand held tool for about $132 to program them for the use on a Tesla. (The same Autel hand held can identify "dead battery" sensors. Last summer, I had 3 out 4 TMPS sensors that went dead only 18 months after buying them. Apparently, they were fitted with a crappy batch of Chinese batteries. Without the Autel hand held, I would have gone a little crazy trying to swap out wheels, one at a time, with a wheel from a set with good sensors, trying to find that one suspected dead sensor....)