Got 2 from my kegerator that I won't be using.
Beer Keg Taps (Couplers)
Not sure if the probe is stainless steel or tin/nickel, so I'll price them as if they are tin/nickel.
$20 each plus shipping ($2-3) or both for $35 plus shipping.
I'm in Austin TX so shipping to most places should be pretty cheap via USPS.