I just got one a couple days ago; https://www.amazon.com/dp/B09M8BMRXP?psc=1&ref=ppx_yo2ov_dt_b_product_details
Works perfectly, nothing plugged into the laptop so totally undetectable, it just has a little rotating disk that randomly moves the mouse around the screen. I guess $25 is on the expensive side, but come on, it's $25
https://www.amazon.com/ENUSUNG-Undetectable-Mechanical-Adjustable-Drive-Free/dp/B09M8BMRXP
I plug this into an outlet so it's not recognized as being connected to my work laptops. A cheap corded mouse to go along with it. One for each computer.
I have this model of a mouse jiggler. It connects from the wall and all you have to do is put your mouse on top of it. It will wiggle and fake the sensation of someone moving it.
https://www.amazon.com/ENUSUNG-Undetectable-Mechanical-Adjustable-Drive-Free/dp/B09M8BMRXP