For the Germans (maybe other countries as well): The Lidl smart home things are nearly all Zigbee based. So far no problems with them and they are, IMO, reasonably priced. I somehow trust Lidl more to not burn my house down than random Amazon sellers. They also sell a Zigbee gateway that phones home by default, but can be converted to local only, dumb mode that works fine with Home Assistant [1] with a tiny bit of soldering. I use these exclusively without problems, even the one I rooted for my parents works without any maintenance.
