Meritline.com offers this Mini USB Car Charger for $2.99. Coupon code "MLCKALLINONE042170NL1" drops it to 99 cents. With free shipping, that's the lowest total price we could find for such an item by $2, although we saw a similar one for slightly less three weeks ago (since expired). This adapter allows you to charge a USB device via a car's cigarette lighter; a USB cable is required.

Expect this item to take two to three weeks to arrive.