As much as we've talked about portable chargers, we've yet to come across one that I would call affordable (excluding the various deals we've found, of course). Satechi just changed all that, though; it released a 10k mAh power pack for $50. Fifty dollars! Considering I've reviewed portable chargers with half that capacity for nearly double the cost, I woudl say this one is a good deal right out of the gate.
Not only that, but it's a dual USB charger, so it can juice up two devices at one time. It has a 5V/1A port for devices like smartphones, and a higher-rated 5V/2A port for more power hungry devices.