Walmart offers the Flowtron Half-Acre Electric Insect Killer for $27.39. Opt for in-store pickup to cut it to $26.32. That's the lowest price we could find by $14. It features a non-clogging killing grid, weatherproof construction, and high intensity bulb.

Update: The price has dropped to $26.32 before in-cart discount, $25.29 after.