One cheap device that has a fairly predictable tempco over a fairly good
range of temperatures is the lowly ceramic resonator - especially the
low frequency variety (e.g. 400-500 kHz) having a reasonably straight
line temperature versus frequency curve. If one already has a decent
frequency reference on hand, it might be interesting to characterize it
for both linearity and retrace.
Depending on the needed accuracy, I would suspect that it would be
easily beat by a calibrated and dithered DS18B20 or a thermocouple - not
to mention an LC or even a Y (a.k.a. "parallel") cut quartz
crystal-based oscillator, to name but two.
73,
Clint
KA7OEI
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