DecorNova Direct via Amazon offers its DecorNova 39-Foot 240 LED String Lights in Warm White for $14.99. Coupon code "VOI6OVIY" drops it to $11.99. Plus, Prime members bag free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $6.14.) That's the lowest total price we could find by a buck. It features a timer and requires three AA batteries.