13Deals offers the Energizer LED Automatic Path Light 2-Pack, model no. ENLPLPAT2, for $9.99 with free shipping. That's the lowest total price we could find by $6. They plug into the wall and feature auto-on/off sensors.
Need more than one? Add two to your cart and the price drops to $15.98 (a $16 price low), or add three to your cart for $18.99 (a $29 price low). Additional units after three can be added to your cart for $6.33 each.