Ou-Band via Amazon offers its Ou-Band Pest Control Ultrasonic Repeller 2-Pack for $37.99. Coupon code "J32DUI8W" cuts that to $18.99. With free shipping, that's $19 off and tied with our mention from two weeks ago as the best price we could find. They each cover an area of 1,200 square feet. Deal ends May 31.