They aren’t cheap but I used to work at a company that had a bunch of them. We used them to test phones.
Since you seem to have some expertise, I will ask you about this aspect.
“The devices work by tricking mobile devices into locking onto them instead of legitimate cell towers, revealing the exact location of a particular cellphone.”
I say BS. It cannot reveal the exact location. It can only reveal a DISTANCE from the Stingray device, just like cell phone towers can do.
You would have to lock onto two different towers (or stingray devices) to establish an exact(within several hundred feet) location.
P.S. Of course, the stingray could get the cell phone to transmit it’s GPS coordinates back to the stingray device, but my question to you would be, does it do that ?