I would reckon most builders include kitchen mixers as standard nowadays.
I bought a screw on vegie sprayer from Bunnings a couple of years ago. It screws onto a normal mixer tap. You have to take off the end of it.
Cost about $7-$10 I think. I love it. It swivels so you can spray water around the sink if needed. You just have to pull a part of it downwards to be a sprayer or push it back up and it is be just like a normal tap.
Our new house we are having a vegie spayer tap that comes our of it's housing, like a hose.