I'm the cheapest man on the planet, and even I think that 200 bucks is a steal for a photobooth.
The reason is, to build a photobooth from scratch you need:
A shell
A monitor
A pc
A digital camera/webcam capable of being controlled via said pc.
A control panel with big old buttons
A printer, preferably a specialized photo printer
Software capable of seemlessly pulling all of that junk together in an attractive and easy to use way.
The concept of a photobooth is pretty simple, but actually doing it is deceptively complex.