Oak Leaf via Amazon offers its Oak Leaf 4.9-Foot 30-LED String Lights 2-Pack in Warm White for $7.99. Coupon code "FEWKUI9B" cuts that to $4. Plus, Prime members bag free shipping. That's a buck under last month's mention and the lowest price we could find by about $7. Each string requires a CR2032 battery (included). Deal ends June 30.