Kmart offers the LightKeeper Pro Repair Kit, model no. 1201, for $17.99. Opt for in-store pickup to dodge the $5.99 shipping fee. (ASavings via eBay charges the same.) That's the lowest total price we could find by $6. Designed for use with light sets (such as Christmas tree lights), it features a voltage detector, bulb puller, and fuse tester. Batteries are 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. Plus, Shop Your Way Max members are eligible for free shipping.