Kmart offers the Pure Garden Solar LED Garden Bug Zapper 2-Pack, model no. 80-6018-c, for $19.27 plus $6.50 for shipping. That's the lowest total price we could find for this quantity by $8. (For further comparison, we saw a 3-pack for $35 shipped a year ago.) Each zapper stores up to eight hours of light and includes a dusk to dawn sensor and requires one AA battery (included.)
Of note, Shop Your Way Rewards members will earn a Kmart credit with this purchase and may be eligible for additional credits and discounts.