@ZWL-Andre Some important questions I either somehow missed or have not been asked and answered.
- Where are you in the world?
- What is your definition of cheaper? cheaper than what?
- Are you still on HASS as well as Hubitat?
I see you posted a link to Z2M. That opens the door for a huge number of inexpensive motion sensors. Many of us (myself included) run both hubs and use HADB to bring devices from HA to HE for automation. Some go the opposite direction with the HE > HA integration. And still others (me again) use both directions for various reasons.
For me, a good motion sensor is one that works consistently, and only when I really need it, resets to inactive quickly. In my home, there is only one place where I find that is actually neseccary, and that is my garage. Of course you have your reasons, but the location may change the requirements a bit. For example, inside vs out, since you mentioned Hue motion sensors. I have three of the Outdoor Hue motion sensors and I agree that they are very good (I personally didn't like the indoor Hue as much).
Therefor, without all the information, I can tell you that my experience is Hue Outdoor are excellent, and not always expensive on Amazon for used prices. But if you're outside North America, that might be different. For indoor, Aqara P1 can be set down to a 2 second detection interval and I don't persionally find $30 CAD to be a bad price for such a good sensor that runs for so long without needing its batteries changed.
If you don't mind hacking a bit, the original Aqara motion sensors from Aliexpress are only $12 CAD with free shipping (depends on where you are for your price). These can be easily modified to reset in 1 second. On Z2M they are very stable. I use one modified original Aqara and one Aqara P1 in my garage. The original Aqara is above my hubs and other gear, so it was easy for me to add a 5v to 3v buck converter so that one never needs batteries, and there's plenty of open USB ports nearby to power it.
