Compensating for the temperature will never be as accurate as actually controlling it (O is for ovenized). I keep reading about chip scale atomic clocks coming down in price but I've yet to see them as the oscillator in anything mass produced.

When 2G started being decommissioned ebay was suddenly flooded with super cheap rubidium frequency standards from parted out base stations.

I'd love to have some.

Also cheap OCXOs.