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Where can I buy a premade vox / PA-style voice-override circuit?

I have a pair of hearing protection headphones.  I want to play radio & walkie-talkie through them.  However, when the walkie talkie plays, I want the radio to cut out.

This is a basic PA-style circuit.  Some sound mixers have this too.  I can find circuit schematics online, but no time to build a circuit.

Is there a pre-made device I can buy to do this?  Ideally it'd be a small box with 3 audio jacks - 2 inputs & 1 output.  One of the audio inputs would override the other.

This would also be great for things like music + GPS in the car.  Is there something premade that I can buy?  I'd rather not have to build & debug a DIY circuit, as I really don't have the time right now.