Airtex Part # 5S1189 from Rockauto.com sells them for 13.11 + shipping. Got 2 just in case I break one putting it on.
Called the Dodge place. They are obsolete, they do not have or stock them, can't get them, and do not have a cross-reference to anything else. In other words, if you have a bad Battery Temp Sensor and you want a replacement, give Rockauto.com a try or go to a junkyard.
I also checked with OReillys, Advance, and AutoZone - they don't sell them either.