> I'm ok paying up to about $10 roughly for the sensor, but i'm
> finding the LM335 and maxim/dallas chips have a very very
> slow response time, up to about 3 minutes or more, which
> isn't what i need. Now thinking about it, an accuracy or 1
>degree is perfectly fine, and with some calibration i  could
> probably make it even closer.

This small pdf shows what can be done with thermistors

http://www.metone.com/pdf/060seriesDS.pdf

They claim < 10 seconds response time and 0.1C with something
called a "multi-stage solid state thermistor, highly linearised"

Google for +thermistor +"response time"

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