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Gizmo Guy: We have an embarrassment of surveillance options

How paranoid are we? Seriously, you might decide, after shopping the big-box store shelves clogged with home security cameras. Not long ago, snoop cams were mostly the province of such specialty companies as Swann that market hard-wired, CCTV (closed-circuit television) cameras and time-lapse video recorders to shopkeepers and large estate owners. (A four- to eight-camera Swann system goes for $160 to $700, plus display screen and installation.)

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