EnergyFlux Enduro USB Hand Warmer | $27 | Amazon | Clip the 10% coupon
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It might look like a run of the mill USB battery pack, but EnergyFlux’s Enduro pulls double duty as an electric hand warmer. Its 7800mAh of power can recharge your phone a couple of times, or heat the exterior up to 109 degrees for about seven hours, depending on how cold it is outside.

At just $27 (after clipping the 10% coupon), it beats buying a bunch of those chemical hand warmers that can only be used once, and would make a great last minute gift for anyone living in a cold climate.