I agree. It doesn't seem like that sensor should cost that much. I was wondering if there was a particular vehicle that had the sensor in question - Advance Auto has coolant temp sensors for about $8, but I'd need to know the specific car and year since they don't list the temps with them.
I'd prefer one of these sensors as opposed to the probe in the radiator kind.
The Club - GM Muscle Cars of the Carolinas
-1967 Camaro SS350 clone - 350/TH-350 with shift kit, CompCams XE268H, Dynomax Jet-Hot headers, Flowmaster American Thunder exhaust, Vintage Air
-2002 Impala LS - Medium Bronzemist Metallic, every option except engine block heater
<A HREF="http://www.furman.edu/~jtrauner" TARGET=_blank>Click here to see my Camaro and my parents' 2002 Impala LS.