Woot offers Bell + Howell Pest Repeller with Extra Outlet Set of 3 for $16.99 (reg $29.99). Free shipping for Prime Members.

Product Description:
Bell & Howell Ultrasonic Pest Repellers provide fast and effective protection against mice, rats, ants, roaches and spiders. They are chemical free making them the safest option to eliminate unwanted rodents form virtually any indoor space. These pest repllers use ultrasonic vibes to repell roches, ants, mice bugs and other creatures though will pose no harm at all to any household pets.
The Bell + Howell pest repllers work whisper silent all hours of the day as long as they're plugged in. You will be amazed at the decrease in bugs & roaches you'll find in your home!

• Helps repel mice; rats; spiders; ants; roaches
• Light to indicate ultrasonic vibes are working
• Plug it in drive pests out
• Pet safe
• No harmful chemicals: chemical free & odor free
• Imported; China