Walmart offers the Munchkin Light My Way Nightlight for $6.49. (Target offers it for the same.) Opt for in-store pickup to avoid the $5.99 shipping charge. That's the lowest price we could find by $6. It requires three AAA batteries, included, and features a 20-minute automatic timer.

Update: The item at Walmart has increased in price; however, Target still offers it for $6.49 with free pickup.