Anker’s travel charger works in almost any country and is down to $20 - The Verge

Anker's Nano Travel Adapter has dropped to $19.99 in black, $6 off its usual price, available at Amazon, Best Buy, and directly from Anker with a promo code, matching its lowest price to date.
The 5-in-1, 20W adapter can charge up to five devices simultaneously through two USB-C ports, two USB-A ports, and an AC outlet for plugging in a standard wall charger.
According to Anker, its four built-in sets of prongs provide compatibility across more than 200 countries and regions.
A single USB-C port delivers up to 20W, which can charge an iPhone 17 to 50 percent in under 30 minutes, though it's better suited to phones, tablets, earbuds, and power banks than laptops.
Laptops can still be powered by plugging their own wall charger into the adapter's AC outlet, since the USB ports lack sufficient wattage for most notebooks.
The compact design measures just an inch thick with prongs folded and weighs 3.8 ounces, though it doesn't convert voltage, so travelers should confirm devices like hair dryers and razors support their destination's voltage before use.