All4Cellular offers the Macally Mini Portable USB Charger, model no. 02095, for $1.99. Coupon code "A4C6A5" drops it to $1.89. With $2 for shipping, that's $3 under our September mention and the lowest total price we could find. This charges USB devices without the need to be plugged into a wall outlet. Coupon expires November 9.