Devices with temporary push-on,push-off switches?
Simple momentary push buttons can be made dirt cheap in quantity.  Push-push switches, definitely not.  The cost ratio between a momentary switch plus a bit of electronics*, vs. a mechanical push-push switch, is huge.  As a bonus, a momentary plus electronics is cheaper to make reliable.

So on a cheap consumer product, the on/off switch is almost certainly implemented by a momentary switch plus some circuitry.  For any given product, you'll have to do a visual inspection, plus maybe some poking around with a multimeter.

* And if the product has a microcontroller in it, that "bit of electronics" can easily be the microcontroller itself.