If you just want bluetooth…

https://www.amazon.com/Govee-Hygrometer-Thermometer-Bluetooth-Notification/dp/B09BHSLWBL

If you want wifi and plan on having a bunch of tupperdors this is a good value. You can add up to 10 devices on a network.

https://www.amazon.com/Govee-Hygrometer-Thermometer-H5151-Temperature/dp/B09BVLP9C5

65% RH Boveda packs all day for New World

https://www.amazon.com/Boveda-65-Percentage-Individually-Wrapped-Humidity/dp/B00FWPQ8WC

MedAngel makes a neat little bluetooth LE sensor you can keep with your insulin. It will store the temperature data, and then when you reconnect it will sync and give you any warnings if your insulin got too cold or warm.

Edit: it looks like it's sold out, but there are other bluetooth temperature sensors that work similarly