ECmallUS via Amazon offers the Meterk EMF Radiation Detector for $37.97. Coupon code "T7FV6RM3" cuts the price to $21.64. With free shipping, that's the lowest price we could find by $6, although we saw it for $7 less two weeks ago. It features an LED-backlit LCD, sound/light alarm, and range of measurements. Deal ends December 11.