Youmall via Amazon offers the Vensmile Ultrasonic Plug-In Pest Repeller 6-Pack for $29.99. Coupon code "K5D2ICEA" cuts that to $17.99. With free shipping, that's a buck under our May mention, $12 off, and the lowest price we've seen. Each device emits low frequency sound waves to repel pests and covers an area of 1,200 square feet; it can take two to three weeks to take full effect. Deal ends July 22.

Only need the 2-pack? The same coupon cuts that from $12.99 to $7.79.