I got the little round doorbell from home depot. It was lighted and worked great for about 6 months, then the light died.
The switch is a standard bell switch, and cost about 2 or 3 bucks. If you could get the same size and a little better quallity it might last longer.
FYI all door bell buttons are low voltage (<24V), though of slightly different voltages and household ones generally work on AC current, but there is no problem switching if you find one that fits and you like the look.
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