I personally would use an LM34CZ from Digi-Key (<$6.00) soldered and shrunk onto a 3 or more conductor cable. DPMs from MPJA range from about $8 to $15. The power supply would depend on the DPM, probably 5 or 9 volts, derived from a used wall wart. Output is 10mV per degree F from -40 to +230 degrees. Set the meter for a 2 volt range and one decimal place and you will read the temperature within a couple of degrees.
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=LM34CZ-ND
http://www.mpja.com/products.asp?dept=52

Joe