via slickdeals:
Monoprice has various Z-Wave Plus Sensors and Items on Sale (FS) - $17.99 at Monoprice
$17.99 ($24.99) - Z-Wave Plus® Door/Window Sensor, NO LOGO [monoprice.com]
$21.99 ($24.99) - Z-Wave Plus® Shock Detector, NO LOGO [monoprice.com]
$19.99 ($24.99) - Z-Wave Plus® Recessed Door/Window Sensor, NO LOGO [monoprice.com]
$21.99 ($24.99) - Z-Wave Plus® PIR Motion Detector with Temperature Sensor, NO LOGO [monoprice.com]
$19.99 ($24.99) - Z Wave Plus Door and Window Sensor, No Logo [monoprice.com]
$24.99 ($34.99) - Z-Wave Plus PIR Multi Sensor, Temperature - Humidity - Light [monoprice.com]
$19.99 ($22.99) - Z-Wave Garage Door Sensor, NO LOGO [monoprice.com]
$22.99 ($29.99) - Z Wave Plus Wall Socket Plug in Receptacle with 2 USB and 1 AC Port [monoprice.com]
$29.99 ($34.99) - Z-Wave Plus Plug In Power Monitor [monoprice.com]