Been re- using them since '07 now with no issues.
I <believe> the seal comes with a new valve stem and so is available without buying a new sensor but it is still pretty stingy at around $50 for the stem (which does not include a new valve stem cap- hey, they can not be giving the whole world away.... ).
Brian
I am wondering for those of you who have changed your TPMs batteries did you replace the rubber grommet or seal on the valve stem or did you re-use as is. The service manual does not reference this that I can see. Did a search but could not find anything specific on the stem seal.