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Allpowers Direct via Amazon [amazon.com] has their 20800 mAh portable power bank on sale for $ 17.99 with code D5JK8OEE.

Specs:

Exclusive iPower and Fast Charging Technology: It can automatically adjust the current and voltage to achieve maximum power,delivering its fastest possible juice up to 3amps per port or 4.5amps overall

4.5A Output Charging: Can charge two smart devices simultaneously at top speed, add 7+ charges to iphone6, 5+ charges to Galaxy S6, 2 charges to ipad air