56' Solar Patio String Lights $26

This Addlon 50' Set of Outdoor Solar String Lights drops from $34.99 to $25.99 at Amazon. This brand always has good reviews, and similar sets are around $10 more. They're attached to a solar panel that you can place in the sun, and then hand the lights without needing to be near an outlet. They turn on automatically at night, but you also get a remote control that can turn them on or set a timer. Shipping is free with Prime or when you spend $35. Otherwise, it adds $6.99.