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Look for a deauth detector. On Amazon you can find an ESP8266 preflashed with deauth detection firmware and it includes a hardware buzzer. The firmware is probably something like this: https://github.com/SpacehuhnTech/DeauthDetector

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I don't know where they got the deauthing thing from. The majority of criminals are just using straight up jammers from China.

I can't imagine it's hard to make a jammer given that wifi is often naturally jammed. You could generate very strong signals in the correct frequency range with a modified microwave; you'd just need a way to modulate the signal to make noise, which you might be able to do physically, or by further modifying the microwave (one of those rare times you want a noisy power supply!)

Of course, portability might be a problem.

I wonder if a standard WiFi router plus directional antenna (and set to the same band) might be enough.

Standard WiFi AP only broadcasts short identification/presence beacon frames once a second or so.

With a firmware that supports TX99 (a mode where radio is transmitting all the time, typically used for testing/certification process)- easily.

You can buy esp32 boards preprogrammed with wifi deauthing from china too.

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