Amazon has two Acer universal travel adapters for just $3.50 each right now (46% off)

Acer Universal Travel Adapter (2-pack) Buy for $7 (Reg. $13) What we love We feature discounted travel adapters fairly often around here, but they usually have a lot of bells and whistles with various USB-A and Type-C ports. These swap that out for sheer affordability. The offer up a singular AC outlet, but you get two for $7 (or $3.50 each).