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If you save the old ones you can dig out the old battery and solder a new one in to reuse them. Just use black silicone to seal them back up again. Big savings if you are inclined to do so.
I bought new Schrader sensors to replace my 10 year old OEM sensors (made by Schrader). Those will be installed with my new tires in the spring. The sensors came with the kit for each sensor.
I got a great deal at $30.00 per
I will save my old sensors and replace the batteries, just to see if it can be done. If so, I'll use them in my other GM.
If you buy your tires from America's (Discount) Tires you'll not only get a great price on the new tires, but they will rebuild or replace your TPMS units and recalibrate them to the car's system.