Or go to any bicycle store. Motion pro sells a very nice one for $7.50, and you can find them all over ebay for less than half that. All valve cores are the same. Well, I should clarify that a bit. There are two types of valves - Schrader and Presta (I think that's the other one). Cars and trucks and motorcycles use Schrader; Presta is the super thin one that you find on racing tires on bicycles. I'd go to a real auto parts store - one that sells to service stations (e.g. Auto Parts Wearhouse, NAPA, etc) because they have to sell products that work, unlike Auto Zone and Advance, and buy half a dozen valve cores. Pardon my bias, but the guys who work at the local A-Z and Advance parts houses seem to turn over daily, know about as much about auto parts as I know about Tasmanian politics (well, less probably) and are as helpful as a junk yard dog. Yes, I'm not being kind, but I've been frustrated at these places regularly and only go to them on Sundays and after hours. If your outlets of these stores are good, patronize them! - you could be blessed with the kind that are near me.
Consider the 'T' valve stem. You put a TPMS sensor on the top and the horizontal arm gets the air chuck for adding air. Of course, when you install these you need to break the bead so its a good idea to do this when you are replacing tires. That way you will be rebalancing the wheels anyway.