Aukey Direct via Amazon offers its Aukey Quick Charge USB 3.0 Dual Port Wall Charger for $19.99. Coupon code "P6DQ37MS" cuts it to $10.99. With free shipping for Prime members, that's the lowest price we could find by $13. It adaptively charges all 5-volt USB powered Android and Apple devices.

Note that this item will be back in-stock on August 26.