Here’s a great deal on the Black & Decker 10 watt power supply. This rechargeable power source supplies a charge by either a USB outlet (sorry - it doesn’t power my iPhone via the USB) or an AC outlet. This rechargeable source is flexible due to the included AC outlet which will supply enough power to re-charge most portable electronics. Naturally it’s not going to power your hair dryer, but the manufacturer specifies up to 1 hour of extended runtime and for a price of $14.95 (75% off) I don’t think you can go too wrong.

Black & Decker 10 Watt Power To Go Cordless Compact AC/USB Power Supply