It's pretty rare, being a homebrew title. But it only cost $15 That's expensive for Atari games in general, but not for new games.

You can get it at AtariAge, last I checked, that's where I got mine.

Atari probably didn't originally do voice, because of the cost of a 16 k cart. The original Berzerk was 2 or 4 k I think. But VE is 16.

Oh yeah, it says four phrases, not 3, I don't remember what I listed, so I'll post them all here.

Intruder aleart, Intruder aleart.
The Humanoid must not escape.
Get the Humanoid.
Chicken Fight like a Robot.

It's surprising how much the phrases add to the game.