The Sonoff SNZB-03 work well and are inexpensive as is the Third Reality Sensor. Stay away from any tuya/Aqara stuff NOT labelled Zigbee 3 - and remember things can be iffy regardless for the really super cheap devices no matter how tempting.
The "hot" product right now seems to be the Aqara FP1 which is a "presence" sensor. Meaning it detects people via mmwave rather than IR. It can tell if people are in a room but not moving. Acts like a motion sensor. @kkossev has written some excellent community drivers for it and other Aqara/Tuya stuff. The only issue is it's not cheap.. but works great. You can find them on AliExpress.
If you decide to get a Hubitat Elevation report back and we can give you some additional advice like installing the community based Hubitat Package Manager which streamlines installation and updates of community apps and drivers like for the FP1 for example.
