Ysmile via Amazon offers two Diaotec Ultrasonic Pest Repellers for $19.99. Coupon code "TBL6YHR8" cuts it to $10.99. Plus, Prime members bag free shipping. That's $3 under our March mention and the lowest price we could find today by $13. This device claims to repel mice, roaches, and other pests via 20kHz to 85kHz changing ultrasonic sounds. It features a night light and coverage up to 1,950 feet. Deal ends May 21.

Need more? The 4-pack is $18.14 with free shipping via the same coupon code.