Minifigure Display Case – Black 16″ × 11″ × 2″ Showcase Cabinet with LED‑Lit Shelves, Mini Figurines Display Case with Built‑in Feet, Battery‑Powered, Cord‑Free Collection Display

If you check this case put on Amazon, it has a spot for 2 AA batteries. You can probably figure out a way to run the LEDs off of batteries since they don't usually require a full outlet worth of power. Just an idea! display case