Need Recommendation for inexpensive temp sensors

I need a couple of “Things” that will report temperature. I just want to put them up in my attic. Any suggestions? Thanks

Xiaomi do a range of sensors that are not only small, but cheap as well.
I have motion and door sensors and both work extremely well.
Not sure where you are based but do a search and you will find them.
You will need to download and install a DTH for them.

This might be helpful to you…