IC temperature sensors have a wide price range. Older chips tend to keep the price, the manufacturers don't feel the need to lower it.
Note that some are much better than the specs especially a 1% spec (but some are worse)
Precision NTC thermistors are very good.
Here's the first one on Digikey: 0.05C 0-50C for $7
They have good interchangeability of (holy shit 0.05C - used to be 0.3C) degrees, very low noise, very easy to measure accurately (voltage reference not needed), and low thermal leakage through the fine wires.
But, you have to calculate the temperature.
I am also fond of the IC's that use transistors as diodes with resistance cancellation like TMP513,ADM1034. You just use any bipolar transistor as the sensor, and they are remarkable interchangeable. The nice thing is that you can get transistors in any package/size you can imagine, and they cost next to nothing
Note that when you use digital sensors with internal sensing, the conversion power results in systematic error.
Also be aware that apart from accuracy, some actually have very high noise levels - significantly greater than the resolution they boast.