Little Kangaroo via Amazon offers the Yvelines Indoor Air Quality Monitor for $129.99. Coupon code "NLXJRSHH" cuts that to $64.99. With free shipping, that's $65 off and the lowest price we could find, although we saw it for $13 less a month ago. It monitors carbon dioxide, carbon monoxide, humidity, temperature, and airborne chemicals and features an LED-backlit display, safety alarm, and up to 24 hours of run-time per charge. Deal ends February 7.