DailySale offers this Ultimate Mosquito Killer and Pest Control LED Bulb for $19 with free shipping. That's tied with our March mention and the lowest total price we could find by $12, outside the price below. This dual-purpose bulb features a UV light that attracts and kills mosquitoes and other bugs.
A close price: Knightly Deals via Amazon has it for $19.97 with free shipping for Prime members.
Note: The countdown timer on the product page does not reflect an actual expiration time and resets daily.