Patozan via Amazon offers the Mpow 36-watt 5-Port Smart USB Wall Charger for $23.99. Coupon code "MPOW36WG" cuts it to $16.99. Plus, Prime members bag free shipping. (Non-Prime members can spend $35 or more to qualify for free shipping; otherwise, shipping adds $6.98.) That's the lowest total price we could find by $6. It includes an 8-foot cord, and its smart USB charging port controller will detect attached devices and adjust power supply settings to avoid any compatibility issues.